BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Distinguishability versus Indistinguishability of Agents in Metapo pulation Epidemic Models DTSTART;VALUE=DATE-TIME:20231005T153000Z DTEND;VALUE=DATE-TIME:20231005T155000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-145@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jesús Gómez Gardeñes (Universidad de Zaragoza)\nT he analysis of contagion-diffusion processes in metapopulations is a power ful theoretical tool to study how mobility influences the spread of commun icable diseases. Here we address the impact that recurrent patterns of mob ility\, and the spatial distribution of distinguishable agents\, have on t he development of epidemics in large urban areas. We incorporate the disti nguishable nature of agents with respect to both their residence and their usual destination. The proposed model allows both a rapid calculation of the spatiotemporal pattern of the epidemic trajectory and the analytical c alculation of the epidemic threshold. This threshold is calculated as the spectral radius of a mixing matrix that encompasses the residential distri bution and the specific travel patterns of the agents. We demonstrate that the simplification of indistinguishable individuals overestimates the val ue of the epidemic threshold\, and we will also show the usefulness of the addition of distinguishability in designing epidemiological control and s urveillance strategies.\n\nhttps://fisindico.uniandes.edu.co/event/15/cont ributions/145/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/145/ END:VEVENT BEGIN:VEVENT SUMMARY:Steady state of a two-species annihilation process with separated reactants DTSTART;VALUE=DATE-TIME:20231006T222000Z DTEND;VALUE=DATE-TIME:20231006T224000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-142@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Diego Luis Gónzalez (Universidad del Valle)\nWe des cribe the steady state of the annihilation process of a one-dimensional sy stem of two initially separated reactants A and B. The parameters that def ine the dynamical behavior of the system are the diffusion constant\, the reaction rate\, and the deposition rate. Depending on the ratio between th ose parameters\, the system exhibits a crossover between a diffusion-limit ed (DL) regime and a reaction-limited (RL) regime. We found that a key qua ntity to describe the reaction process in the system is the probability $p (x_A\,x_B)$ to find the rightmost A (RMA) particle and the leftmost B (LMB ) particle at the positions $x_A$ and $x_B$\, respectively. The statistica l behavior of the system in both regimes is described using the density of particles\, the gap length distribution $x_B-x_A$\, the marginal probabil ities $p_A(x_A)$ and $p_B(x_B)$\, and the reaction kernel. For both regime s\, this kernel can be approximated by using $p(x_A\,x_B)$. We found an ex cellent agreement between the numerical and analytical results for all cal culated quantities despite the reaction process being quite different in b oth regimes. In the DL regime\, the reaction kernel can be approximated by the probability to find the RMA and LMB particles in adjacent sites. In t he RL regime\, the kernel depends on the marginal probabilities $p_A(x_A)$ and $p_B(x_B)$.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributio ns/142/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/142/ END:VEVENT BEGIN:VEVENT SUMMARY:Determination of the free energy landscape of ultrasmall silver cl usters with metadynamics and machine learning techniques DTSTART;VALUE=DATE-TIME:20231006T220000Z DTEND;VALUE=DATE-TIME:20231006T222000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-183@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Olga López-Acevedo (Universidad de Antioquia)\nAb i nitio metadynamics enables the extraction of free energy landscapes with t he precision of first-principles electronic structure methods. We develope d and used an interface between the PLUMED and ASE codes to estimate the f ree energy of Ag5 and Ag6 clusters at 10\, 100\, and 300 K with the radius of gyration and coordination number as collective variables [1]. We find that Ag6 is the smallest silver cluster where entropic effects at room tem perature increase the probability of the nonplanar isomer to a competitive state. To accelerate the determination of the free energy we currently us e machine learning algorithms.\n\n[1] J. Chem. Phys. 156\, 154301 (2022)\n \nhttps://fisindico.uniandes.edu.co/event/15/contributions/183/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/183/ END:VEVENT BEGIN:VEVENT SUMMARY:Explaining the complexity of Colombian climate from the non-extens ive extremal behavior DTSTART;VALUE=DATE-TIME:20231006T214000Z DTEND;VALUE=DATE-TIME:20231006T220000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-181@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Isabel Cristina Hoyos (Universidad del Quindio)\nThe Tsallis’ non-extensive statistical mechanics is a generalized framework for describing complex systems where ergodicity (and statistical equilibr ium as its macroscopic manifestation) is just one of the dynamic possibili ties of microscopical mixing. In practical manners\, the generalization fr om Tsallis’ theory introduces a non-extensive entropic functional Sq thr ough the q-index\, which accounts for how far is Sq from SBG\, identifies non-additive universality classes\, and provides physically based informat ion about the underlying dynamics. The Tsallis’ theory is being progress ively applied in complex systems\, in particular\, relative to geophysical processes such as climate extremes\, which are the result of weather cond itions far from equilibrium emerging from spatiotemporal multi-scale inter actions\, long-term memory\, a high degree of information content\, and pe rsistent positive feedback.\n\nIn this work\, we evaluate the complexity o f the Colombian climate via the extreme behavior of temperature and precip itation over a non-stationary detrended threshold. Based on a maximum like lihood estimation of the maximum entropy\, we find the regional non-extens ive parameters for the normalized q-exponential distribution with constant mean as a constraint. \n\nThe spatial structure of the regional q-index s hows 59% (39%\, 2%) of bounded (unbounded\, in the Boltzmann-Gibbs limit) behavior for gauge temperature in the Caribbean Colombian Catchment (CCC) and 50% (50%\, 0%) in Pacific Colombian Catchment (PCC). For gauge precipi tation\, we have 25% (67%\, 8%) of bounded (unbounded\, in the Boltzmann- Gibbs limit) in the CCC and 15% (77%\, 8%) for the PCC. These results evid ence an essentially nonextensivity in Colombian climate and furthermore\, temperature and precipitation extremes do not share the same universality features.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/181/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/181/ END:VEVENT BEGIN:VEVENT SUMMARY:Bayesian analysis of free energies using Cryo-EM particle images DTSTART;VALUE=DATE-TIME:20231006T212000Z DTEND;VALUE=DATE-TIME:20231006T214000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-182@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Pilar Cossio (Flatiron Institute)\nCryo-electron mic roscopy (cryo-EM) has recently become a leading method for obtaining high- resolution structures of biological macromolecules. However\, cryo-EM is l imited to biomolecular samples with low conformational heterogeneity\, whe re most conformations can be well-sampled at various projection angles.\nW hile cryo-EM provides single-molecule data for heterogeneous molecules\, m ost existing reconstruction tools cannot retrieve the ensemble distributio n of possible molecular conformations from these data. To overcome these l imitations\, we build on a previous Bayesian approach and develop an ensem ble refinement framework that estimates the ensemble density from a set of cryo-EM particle images by reweighting a prior conformational ensemble\, e.g.\, from molecular dynamics simulations or structure prediction tools. Our work provides a general approach to recovering the equilibrium probabi lity density of the biomolecule directly in conformational space from sing le-molecule data. To validate the framework\, we study the extraction of s tate populations and free energies for a simple toy model and from synthet ic cryo-EM particle images of a simulated protein that explores multiple f olded and unfolded conformations.\n\nhttps://fisindico.uniandes.edu.co/eve nt/15/contributions/182/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/182/ END:VEVENT BEGIN:VEVENT SUMMARY:Beyond molecular kinetics: statistical physics methods in systems biology DTSTART;VALUE=DATE-TIME:20231006T210000Z DTEND;VALUE=DATE-TIME:20231006T212000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-146@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Manuel Pedraza (Departamento de Física\, Unive rsidad de los Andes)\nBasic methods of statistical physics have proven ext remely useful in the modelling of enzyme dynamics\, but now the concepts o f statistical physics have become important tools in many areas of systems biology\, such as protein folding\, site search on DNA\, gene regulation\ , evolutionary dynamics or information processing. I will present an overv iew of the use of the concepts (more than the mathematical tools) in diffe rent areas of biological modeling\, with emphasis on how collective action arises and how cells can deal with imperfect information about their envi ronment.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/146/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/146/ END:VEVENT BEGIN:VEVENT SUMMARY:No-Fusion and Fusion Process in Log-Coulomb Gases DTSTART;VALUE=DATE-TIME:20231006T202000Z DTEND;VALUE=DATE-TIME:20231006T204000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-160@fisindico.uniandes.edu.co DESCRIPTION:Speakers: John Fredy Mateus Rubio (Universidad de los Andes)\n We study the non-equilibrium dynamics for no-fusion and fusion events in a Dyson gas of $N$ charged particles interacting through a logarithmic Coul omb potential surrounded by a thermal bath at a reduced temperature $\\bet a=q_0^2/(k_BT)$\, where $q_0$ is the charge per particle and $T$ is temper ature of the bath. First\, we characterize the relaxation-time\, $\\tau$\, in the regime for no-fusion processes\, for which the system reach a “t hermal equilibrium” and show how a time-law-scale governs the time-evolu tion for this regime. We prove the validity of Wigner's Surmise for $\\bet a\\geq1.0$ compared with those values used in Gaussian ensembles for times greater than relaxation time $t\\gg\\tau$\, i.e.\, when the system reache d the thermal equilibrium. Finally\, we study the time-evolution of neares t neighbours distance distributions for different $\\beta$ in the regime f or fusion events and compare its dynamics with no-fusion regime.\n\nhttps: //fisindico.uniandes.edu.co/event/15/contributions/160/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/160/ END:VEVENT BEGIN:VEVENT SUMMARY:A path integral approach to work in the Margenau-Hill scheme DTSTART;VALUE=DATE-TIME:20231006T200000Z DTEND;VALUE=DATE-TIME:20231006T202000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-163@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Nicolás T Domínguez (Universidad Nacional de Colom bia)\nAn important task in quantum thermodynamics consists of the characte rization of work and heat in the quantum domain. A common approach to this problem\, known as the two-point measurement (TPM) scheme\, consists of p erforming two projective energy measurements at the beginning and at the e nd of a given evolution protocol. Although its importance for the developm ent of the understanding of work statistics in the quantum regime\, the TP M scheme has a fundamental limitation: since the initial projective measur ement diagonalizes the initial state in the energy basis\, the effect that the initial coherences may have on the energetics of the system is lost. \n\nThe Margenau-Hill (MH) scheme is an alternative scheme that allows ini tial coherent states in the energy basis relying on the replacement of the first projective measurement by an estimation of the initial Hamiltonian from the result of a single projective measurement at the end of the evolu tion protocol. The joint probability distribution describing the scheme\, known as the MH distribution\, is given by the following quasi-probability distribution\n$$P^{MH}(n\,m) = \\frac{1}{2} \\text{Tr}\\left[\\rho_S(0) ( \\bar{\\Pi}_{E_m^\\tau}\\Pi_{E_n^0} + \\Pi_{E_n^0}\\bar{\\Pi}_{E_m^\\tau}) \\right]$$\n\nIn this talk I present a path integral formulation for work in the MH scheme developed in close analogy to that of the TPM scheme\, p roviding further insight on the role of initial coherence in quantum therm odynamic setups.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributio ns/163/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/163/ END:VEVENT BEGIN:VEVENT SUMMARY:Work and heat in weakly measured quantum systems: The way you meas ure matters. DTSTART;VALUE=DATE-TIME:20231006T194000Z DTEND;VALUE=DATE-TIME:20231006T200000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-147@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos Viviescas (Universidad Nacional de Colombia)\ nIn quantum thermodynamics\, fluctuation theorems provide a way for the qu antification of irreversibility of single trajectories. In this work we pr opose a description of the dynamics of single trajectories based on an M-p arametrization of unravellings of the master equation for a system coupled to its environment. We identify the measurable components of the entropy\ , and show ways to measure and control the system in such a way that the q uantum components of the entropy can be corrected or minimized.\n\nhttps:/ /fisindico.uniandes.edu.co/event/15/contributions/147/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/147/ END:VEVENT BEGIN:VEVENT SUMMARY:What can Maxwell’s demon do? DTSTART;VALUE=DATE-TIME:20231006T133000Z DTEND;VALUE=DATE-TIME:20231006T140000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-130@fisindico.uniandes.edu.co DESCRIPTION:Speakers: John Bechhoefer (Simon Fraser University)\nInformati on engines are a modern realization of the Maxwell-demon thought experimen t. They exploit “favorable fluctuations” of a heat bath to generate w ork\, at the cost of dissipation in a measuring device. Experimental test s of these engines require accurate measurements and fast feedback control . We designed a simple information engine using optical tweezers and feed back to raise a micron-sized trapped bead diffusing in water — a heavy m ass — against gravity\, without doing any external work. We first explo re the conditions that maximize engine performance and achieve powers (~10 00 kT/s) and speeds (~190 μm/s) that compare to bacteria\, which have a s imilar size. We then show that naively implemented information engines fa il to function when measurements are too noisy but that more sophisticated measurement “filters” can provide good performance\, even when measur ement noise is comparable to the size of displacements produced by thermal motion. Finally\, we show that placing the bead in an environment with “extra” nonequilibrium fluctuations can dramatically increase power ou tput. These experiments suggest that what was once a mere thought experim ent may have practical applications.\n\nhttps://fisindico.uniandes.edu.co/ event/15/contributions/130/ LOCATION: URL:https://fisindico.uniandes.edu.co/event/15/contributions/130/ END:VEVENT BEGIN:VEVENT SUMMARY:Thermodynamics of Gambling Demons DTSTART;VALUE=DATE-TIME:20231006T191000Z DTEND;VALUE=DATE-TIME:20231006T194000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-132@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Gonzalo Manzano (Instituto de Física Interdisciplin ar y Sistemas Complejos - IFISC (CSIC-UIB))\nMore than 150 years ago\, Jam es Clerk Maxwell introduced a famous thought experiment\, where a little i ntelligent being (the “demon”) defies the second law of thermodynamics by controlling a tiny door between two chambers with gases at different t emperatures. Maxwell’s demon represented a cornerstone in the developmen t thermodynamics of feedback control\, and has attracted renewed attention recently motivated by experiments implementing it at the micro and nano-s cales. In this talk\, I will introduce a new concept of demon\, lacking pr oper feedback control but just allowed to stop the process using a gamblin g strategy [1]. We demonstrate that such gambling demons can still bypass conventional thermodynamic bounds in unexpected ways. Indeed\, the key qua ntity that limits its operation is no longer the amount of information ret rieved about the system\, but a new quantity measuring the asymmetry under time-reversal of the dynamics. We test experimentally the most important features of the gambling demon in a microelectronic system implementing si ngle-electron box\, and realize strategies leading to average work extract ion above the free energy change.\n\n[1] G. Manzano\, D. Subero\, O. Maill et\, R. Fazio\, JP. Pekola and É. Roldán\, Thermodynamics of Gambling De mons\, Phys. Rev. Lett. 126\, 080603 (2021).\n\nhttps://fisindico.uniandes .edu.co/event/15/contributions/132/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/132/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparative Analysis of Surface Charge Density in Planar Metallic Layers: Molecular Dynamics and Method of Moments Approach for Long-Range I nteractions DTSTART;VALUE=DATE-TIME:20231006T165000Z DTEND;VALUE=DATE-TIME:20231006T171000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-135@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Robert Salazar (Universidad ECCI)\nIn this document\ , we study the planar metallic layers at a constant voltage from the point of view of statistical mechanics and electrostatics. We use molecular dyn amics simulations to find the system's positional correlation functions an d velocity distributions by modeling it as a two-dimensional Coulomb plasm a in the liquid phase. Alternatively\, the surface charge density is calcu lated by implementing the Method of Moments (MoM) under the electrostatic approximation. Point-like and differential charges elements interact via a $1/r^\\eta$ with $\\eta\\in\\mathbb{R}^{+}$ - electric potential in both cases. We establish the range of the coupling parameter of the system wher e the surface charge density found in both approaches is in agreement.\n\n https://fisindico.uniandes.edu.co/event/15/contributions/135/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/135/ END:VEVENT BEGIN:VEVENT SUMMARY:Frustration effects on the magnetic behavior of the Fe$_{(73.5-x)} $ Cr$_{(x)}$ Cu$_1$ Nb$_3$ Si$_{13.5}$ B$_9$ system on the road to percola tion DTSTART;VALUE=DATE-TIME:20231006T163000Z DTEND;VALUE=DATE-TIME:20231006T165000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-184@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Andrés Rosales Rivera (Universidad Nacional de Colo mbia\, Manizales)\nhttps://fisindico.uniandes.edu.co/event/15/contribution s/184/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/184/ END:VEVENT BEGIN:VEVENT SUMMARY:Theoretical Determination of Phase Diagrams using the Ising Model and Mean-Field Renormalization Groups (MFRG) with Machine Learning Tools a nd Monte Carlo Simulation DTSTART;VALUE=DATE-TIME:20231006T161000Z DTEND;VALUE=DATE-TIME:20231006T163000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-167@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Esteban Bedoya Rodriguez (Universidad del Valle )\nUsing the mean-field renormalization group method (MFRG) and starting f rom the Ising Hamiltonian\, magnetic phase diagrams were successfully repr oduced in various systems composed of different types of magnetic atoms\, such as FeMnAl\, FeNiMn\, and FeAl alloys. Quadratic errors we obtained be low 0.016\, and a preliminary approximation of the binding energy between atoms of this type was achieved. These latter alloys are of special intere st since\, due to their relative simplicity\, they enable the implementati on of machine learning when adjusting the phase diagram. This leads to a b inding energy obtained through this method. Subsequently\, this energy is introduced into a Monte Carlo simulation using the Metropolis algorithm. \ nIn summary\, the significance of this work lies not only in the discovery of a theoretical method for finding magnetic phase diagrams but also in t he possibility of approximating the functional form of the binding energy in the Ising model.Additionally\, it achieves the implementation of machin e learning in this field of physics.\nIt should be noted that I prefer to present this work in the form of a presentation or talk.\n\nhttps://fisind ico.uniandes.edu.co/event/15/contributions/167/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/167/ END:VEVENT BEGIN:VEVENT SUMMARY:Analysis of phase transition in a CrI3 monolayer using the Ising m odel in a hexagonal lattice DTSTART;VALUE=DATE-TIME:20231006T155000Z DTEND;VALUE=DATE-TIME:20231006T161000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-166@fisindico.uniandes.edu.co DESCRIPTION:Speakers: José David Garavito Barragán (Universidad Industr ial de Santander)\, Nathalia Alexandra Pérez Rojas (Universidad Industri al de Santander)\nIn this work\, the ferromagnetic phase transition in a m onolayer of chromium triiodide (CrI3) was examined. Employing a microcanon ical ensemble approach\, entropy was evaluated as a function of internal e nergy and magnetization was calculated with respect to energy across vario us spin configurations. In this way\, a methodology was found to observe p hase transitions using thermodynamic quantities other than specific heat. The Hubbard model was used to characterize the exchange interactions\, def ined by a first-neighbor exchange energy of J=2.37 meV.\n\nhttps://fisindi co.uniandes.edu.co/event/15/contributions/166/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/166/ END:VEVENT BEGIN:VEVENT SUMMARY:Physical properties driven by phase separation in electron-correla ted materials: percolation and avalanches. DTSTART;VALUE=DATE-TIME:20231006T153000Z DTEND;VALUE=DATE-TIME:20231006T155000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-131@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Gabriel Ramirez (Universidad de los Andes)\nStr ongly electron-correlated materials provide a rich platform for exploring the underpinnings of fundamental physics. These systems are characterized by a complex energy landscape\, originating from the interplay of competin g phases\, which manifests in diverse phenomena including metal-insulator transitions\, multiple magnetic transitions\, and structural phase transit ions. In some instances\, these transitions can coincide\, leading to intr iguing and complex behavior. Viewed from a fundamental perspective\, such transitions can be conceptualized as being driven by an external force to a critical point where the transition ceases to be continuous\, thereby c ausing the system to progress via a series of discrete avalanches and ther efore showing key fingerprints of percolation effects. \n\nHere I will sho w recent research that exemplifies the collective behavior observed in par ticular physical systems [1\,2]. These systems predominantly consist of ox ide materials\, like vanadium oxides and praseodymium-doped manganites\, w hich share a common characteristic: strong electron-electron interactions across multiple scale lengths. Vanadium oxides demonstrate a first-order s tructural phase transition and a metal-insulator transition\, induced by v oltage\, light\, and temperature. In contrast\, praseodymium-doped mangani tes reveal multiple magnetic phase transitions\, magnetic percolation\, an d spin frustration\, offering further layers of complexity.\n\nAcknowledge ments: funding by Facultad de Ciencias\, Universidad de los Andes grant I NV-2023-162-2717\n\nReferences:\n[1] Wolowiec\, C.T. et.al.\, Physical Rev iew Materials 6\, 064408 (2022).\n[2] Carranza-Celis\, D. et al.\, Physica l Review Materials 5\, 124413 (2021).\n\nhttps://fisindico.uniandes.edu.co /event/15/contributions/131/ LOCATION: URL:https://fisindico.uniandes.edu.co/event/15/contributions/131/ END:VEVENT BEGIN:VEVENT SUMMARY:Fast Thermal Equilibration Protocol: Two-step protocol DTSTART;VALUE=DATE-TIME:20231006T144000Z DTEND;VALUE=DATE-TIME:20231006T150000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-158@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Diego Rengifo (Universidad de los Andes)\nWhen a sys tem deviates from equilibrium\, it is possible to manipulate and control i t to drive it towards equilibrium within a finite time $t_f$\, even reduci ng its natural relaxation time scale $\\tau_{relax}$. Although numerous th eoretical and experimental studies have explored these shortcut protocols\ , few have yielded analytical results for the probability distribution of work\, heat and entropy production. In this talk\, we discuss the two-step protocol that captures the essential characteristics of more general prot ocols and has analytical solution for the relevant thermodynamic probabili ty distributions.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributi ons/158/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/158/ END:VEVENT BEGIN:VEVENT SUMMARY:One-particle engine with a porous piston DTSTART;VALUE=DATE-TIME:20231006T142000Z DTEND;VALUE=DATE-TIME:20231006T144000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-134@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos Alvarez (Tec Monterey)\nA modification of the classical Szilard engine is presented\, where pores have been drilled on the piston. This change allows for the traversal of the particle from one side of the piston to the other\, making it unnecessary to remove the pist on from the engine\, nor measure the position of the particle for the engi ne to do work. The dissipation on energy occurs when the mass over which t he engine does work is reset.\n\nhttps://fisindico.uniandes.edu.co/event/1 5/contributions/134/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/134/ END:VEVENT BEGIN:VEVENT SUMMARY:Numerical integration of a class of stochastic differential equati ons with singular coefficients DTSTART;VALUE=DATE-TIME:20231006T140000Z DTEND;VALUE=DATE-TIME:20231006T142000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-140@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Sergio Andraus (Tsukuba Gakuin University)\nThe simu lation of stochastic systems is a valuable tool to investigate a broad ran ge of topics\, from atomistic simulations of colloidal systems and magneti c materials to the simulation of interest rates and derivatives in mathema tical finance. In most cases\, these systems are simulated by integrating the corresponding stochastic differential equations (SDEs) via the Euler-M aruyama\, Milstein or Heun methods\, which are known to be stable and conv ergent whenever the coefficient functions in the SDE satisfy certain smoot hness and regularity conditions. However\, several systems of interest ar e described by SDEs with singularities\, and many of the usual integrating methods become unstable and their convergence is not guaranteed. In this talk\, we explore the particular case of the Bessel process as well as new numerical schemes tailored to handle singular coefficients in SDEs.\n\nht tps://fisindico.uniandes.edu.co/event/15/contributions/140/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/140/ END:VEVENT BEGIN:VEVENT SUMMARY:How to join the force and volume ensembles of granular media DTSTART;VALUE=DATE-TIME:20231005T212000Z DTEND;VALUE=DATE-TIME:20231005T214000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-173@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jose Daniel Muñoz Castaño (Departamento de Física \, Universidad Nacional de Colombia\, Bogotá)\nGranular media consist of a large number of discrete particles interacting mostly through contact fo rces that\, being dissipative\, jeopardizes a classical statistical equili brium approach based on energy. Instead\, two independent equilibrium stat istical descriptions have been proposed: the Volume Ensemble and the Force Network Ensemble. Hereby\, we propose a procedure to join them into a sin gle description\, using Discrete Element simulations of a granular medium of monodisperse spheres in the limit state of isotropic compression as tes ting ground. By classifying grains according to the number of faces of the Voronoï cells around them\, our analysis establishes an empirical relati onship between that number of faces and the number of contacts on the grai n. In addition\, a linear relationship between the number of faces of each Voronoï cell and the number of elementary cells proposed by T. Aste and T. Di Matteo in 2007 is found. From those two relations\, an expression fo r the total entropy (volumes plus forces) is written in terms of the conta ct number\, an entropy that\, when maximized\, gives an equation of state connecting angoricity (the temperature-like variable for the force network ensemble) and compactivity (the temperature-like variable for the volume ensemble). So\, the procedure establishes a microscopic connection between geometry and mechanics and\, constitutes a further step towards building a complete statistical theory for granular media in equilibrium.\n\nhttps: //fisindico.uniandes.edu.co/event/15/contributions/173/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/173/ END:VEVENT BEGIN:VEVENT SUMMARY:A combinatorial calculation of the microcanonical average value of magnetization magnitude for the one-dimensional Ising model DTSTART;VALUE=DATE-TIME:20231005T210000Z DTEND;VALUE=DATE-TIME:20231005T212000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-175@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Kevin Fernando Castrillón Cárdenas (Universidad Na cional de Colombia)\nA common application of the Ising model is the study of ferromagnetic materials and their properties. One of said properties\, **M**\, the magnetization\, can be so easily defined that one may wonder i f it is possible to come up with an analytical way of estimating its avera ge value. Using the microcanonical framework of counting the different sta tes the system can be in\, this work proves a closely related question (de aling with the mean value of $|$**M**$|$\, the magnetization magnitude\, i nstead) can be reduced to a combinatorics problem\, and presents solutions of this for different versions of the one-dimensional Ising model.\n\nhtt ps://fisindico.uniandes.edu.co/event/15/contributions/175/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/175/ END:VEVENT BEGIN:VEVENT SUMMARY:Stochastic theories leading to quantum mechanics in curved space-t ime DTSTART;VALUE=DATE-TIME:20231005T225300Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-153@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Eric Santiago Escobar Aguilar (Universidad Autónoma Metropolitana- Iztapalapa)\nThe universe lives on a Gravitational Wave Ba ckground (GWB). This GWB is extra energy that is not contained in Einstein 's equations\, and new models was developed to explain the accelerating ex pansion of the universe where a GWB is incorporated into Einstein's equati ons.\nIn this talk\, we study this new paradigm: due to GWB\, quantum part icles cannot follow geodesics\, but rather stochastic trajectories. We exp lore the different stochastic theories\, namely Stochastic quantum Mechani cs (SQM)\, Stochastic Electrodynamics (SED) and Scale Relativity (ScR)\, t hat lead to the generalized Klein-Gordon equation in curved space-time and generalized Schrödinger equation.\n\nhttps://fisindico.uniandes.edu.co/e vent/15/contributions/153/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/153/ END:VEVENT BEGIN:VEVENT SUMMARY:Critical properties of the Ising model on fractal lattices DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-156@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Viviana Gómez Ramírez (Universidad de los Andes)\n In the realm of statistical physics\, this study explores the critical pro perties of the Ising model on two fractal lattices with different Hausdorf f dimensions ($d_H \\approx 1.892$ and $d_H \\approx 1.595$). By employing the Monte Carlo technique and the Metropolis algorithm\, a numerical anal ysis is presented to determine critical temperature values and correlation length functions. Additionally\, analytical methods are implemented\, and their results are compared with numerically obtained results. Our finding s confirm that fractals with finite ramification do not exhibit phase tran sitions\, while those with infinite connectivity do.\n\nhttps://fisindico. uniandes.edu.co/event/15/contributions/156/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/156/ END:VEVENT BEGIN:VEVENT SUMMARY:Estudio de la secuencia de armado de un rompecabezas como un proc eso de percolación DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-165@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Benavides (Universidad Nacional de Colombia)\nJ igsaw puzzles are a fascinating pastime that has given many hours of fun t o people since its first appearance as an educational tool in geography in 1766. Multiple studies on human behavior\, the way in which new knowledge is generated\, cognitive styles\, among others\, have been carried out ba sed on the process in which a puzzle is assembled. However\, this work pro poses a different approach in which the sequence used for assembling the p uzzle is studied to determine whether it can be classified as a percolatio n process. Through the development of a web application\, a collection of the sequences used by people to assemble the puzzles was made and with the tools of finite scaling\, the critical density $p_c = 0\,73 \\pm 0\,04$ a nd the exponent $1/\\nu = 0\,28 \\pm 0\,03$ and were obtained. These resul ts are not consistent with the hypothesis that this process can be classif ied as invasion percolation\, however\, they are inconclusive due to the l ack of data for large puzzles. As far as we know\, this is the first work of this nature to study the process of jigsaw puzzle assembly as a percola tion process.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/ 165/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/165/ END:VEVENT BEGIN:VEVENT SUMMARY:Characterization of Fluorescence Correlation Spectroscopy (FCS) fo r Two-dimensional Diffusion Coefficient Measurements DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-168@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Esteban Sandoval Granados (Universidad de los A ndes)\nThanks to Einstein’s relation\, it is known that two-dimensional diffusion coefficients give the amount of area that a particle under Brown ian motion can cover in a determined time. In biological sciences\, the di ffusion coefficient is a relevant parameter to understand the motion of pr oteins and molecules providing quantitative insights into the mechanical p roperties of their microenvironment and their interaction with other molec ules. \n\nAmong the available methods to measure these coefficients\, *flu orescence correlation spectroscopy (FCS)* uses the fluorescence signal ove r time from the illumination volume in a confocal microscope that results from the random motion of fluorescent molecules. The analysis of time corr elations in the fluorescence signal from FCS allow to quantitatively evalu ate the concentration\, interaction between molecules and the diffusion co efficient.\n\nIn this work\, we characterize the FCS method in a model mem brane system\, allowing us to measure diffusion coefficients in a precise way. We use giant unilamellar vesicles (GUVs)\, a popular model for the st udy of the bilayer lipid membrane\, composed of the phospholipid DOPC and the lipophilic fluorophore DiI. Using FCS we characterize the diffusion co efficient of DiI at 37 C and 45 C and corroborate the effect of temperatur e in molecule dynamics. To the best of our knowledge\, this is the first i mplementation of FCS in a Colombian laboratory without use of any speciali zed software or external tools.\n\nhttps://fisindico.uniandes.edu.co/event /15/contributions/168/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/168/ END:VEVENT BEGIN:VEVENT SUMMARY:Phase Separation Dynamics in Calcium and Praseodymium-Doped Mangan ites DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-171@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Joan Sebastian Amaya Bohorquez (Universidad de los A ndes)\nManganites consist of an alloy of manganese oxide ($MnO_3$) in conj unction with a rare-earth element (Lanthanum\, Strontium\, or Germanium). a particular case is Lanthanum manganite doped with praseodymium (LPCMO). This material holds significant interest due to their magnetic phase trans itions occurring below temperatures of 130 K. One of the phenomena observe d is the coexistence of ferromagnetic conducting and antiferromagnetic ins ulator phases\, which varies depending on the doping level and temperature . An intriguing consequence of this phenomenon is the colossal magnetoresi stance\, where an abrupt change in electrical resistance with respect to t he magnetic field is evident. The way these magnetic phases grows as a fun ction of temperature follow nucleation and percolation processes via avala nches as in martensitic transformations. To assess these material properti es\, isothermal hysteresis curves are commonly employed to macroscopically identify the phases present.\\newline\n\nNevertheless\, to capture more d etailed information about the material's properties\, First Order Reversal Curves (FORC) are utilized. Here we used the FORC analysis to decombolute all magnetic interactions within the material. We also employed transport measurements (R vs T curves) combined with magnetization versus temperatu re measurements to pinpoint the precise temperature at which the phase tra nsition occurs and the onsets of the percolation processes. Furthermore\, our experimental results are reproduced using random-Ising model models\, highlighting the significance of disorder and short-range interactions in the magnetic percolation processes. This underscores the role of disorder in shaping the material's magnetic behavior and its impact on phase transi tions\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/171/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/171/ END:VEVENT BEGIN:VEVENT SUMMARY:Heat exchange fluctuation relation for the transition from a micro -canonical to a canonical ensemble in a classical harmonic oscillator DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-172@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jose Daniel Muñoz Castaño (Departamento de Física \, Universidad Nacional de Colombia\, Bogotá)\nHereby we investigate the thermalization of a classical harmonic oscillator starting from a micro-ca nonical ensemble at energy Eo and finishing in a canonical one at temperat ure T. We derived analytically that the probabilities $P(Q)$ and $P(−Q)$ of gaining or losing a certain amount of heat $Q$ are related as $P(Q)=\\ exp(-2Q/kT) P(-Q)$\, a result we also verified through molecular dynamics simulations with an overdamping Langevin equation algorithm. Our results g ive insight into the thermalization process and contributes to extend fluc tuation relations to micro-canonical initial states.\n\nhttps://fisindico. uniandes.edu.co/event/15/contributions/172/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/172/ END:VEVENT BEGIN:VEVENT SUMMARY:A review of the stochastic leapfrog thermostat for Langevin dynami cs DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-174@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Julian David Jimenez-Paz (Universidad Nacional de Co lombia)\nIn molecular dynamics simulations\, thermostats are algorithms kn own for reproducing the canonical or NVT ensemble on a system of particles \, i.e.\, they reproduce a given temperature in the system. In this work\, we review a stochastic thermostat algorithm to reproduce Langevin dynamic s according to the equation $\\dot{v} = \\frac{F}{m} - \\gamma v + b\\xi$ where $F$ is the total external force\, $\\gamma$ is the friction rate\, a nd $\\xi$ is a random variable with mean zero and no time correlation.\n\n This algorithm is a modification to the classic leapfrog scheme\, it adds the impulsive friction and noise terms $\\Delta v = -fv + \\sqrt{f(2-f)(k_ B T/m)} \\xi$ to velocity with $0\\leq f\\leq 1$ resulting in the converge nce of $\\langle v^2 \\rangle$ to $k_B T/m$ therefore conserving the tempe rature. We show that this algorithm not only reproduces the correct averag e temperature\, but it also preserves the canonical distribution of veloci ty throughout the time integration. Furthermore\, we perform simulations t o verify these claims by Ornstein-Uhlenbeck processes for different impuls ive friction constants $f$ and corroborate its relationship with the frict ion rate to be $f=1-e^{-\\gamma \\Delta t}$.\n\nhttps://fisindico.uniandes .edu.co/event/15/contributions/174/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/174/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of a traffic bottleneck using a cellular automaton model DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-151@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Sebastian Florez Jimenez (Universidad Nacional de Colombia\, Bogotá)\nThe formation of traffic bottlenecks in main roads is one of the most common causes of vehicular congestion\, having a bigge r impact in cities with main roads consisting of few lanes i.e. 2 or 3 lan es. A traffic bottleneck creates a challenge for those drivers who are in the congested lane since they must find a way to change lanes in order to surpass the bottleneck. In this scenario the best global outcome is found when an equilibrium between the desire of each driver to move as fast as p ossible and giving the way to other drivers so they can move faster is ach ieved. We analyze a traffic bottleneck in a road of two lanes in the stati onary regime using a cellular automaton model\, for that we look into a va riable that accounts for the probability of a driver to give the lane when asked for it\, and we use it to characterize the efficiency of the bottle neck to transport cars.\n\nhttps://fisindico.uniandes.edu.co/event/15/cont ributions/151/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/151/ END:VEVENT BEGIN:VEVENT SUMMARY:Evolution of temporal fluctuation scaling exponent in non-stationa ry time series using supersymmetric theory of stochastic dynamics DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-161@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Felipe Segundo Abril Bermúdez (Universidad Nacional de Colombia)\nFluctuation scaling is an emergent property of complex syst ems that relates the variance ($\\Xi$) and the mean ($\\Upsilon$) from an empirical data set in the form $\\Xi\\sim\\Upsilon^{\\alpha_{TFS}}$\, wher e the dispersion (fluctuation) of the data has been described in terms of $\\Xi$. Taking into account the path integral formalism developed by H. Kl einert\, we extend the path integral formalism in the context of the super symmetric theory of stochastic dynamics to understand the origin of the te mporal fluctuation scaling and the evolution of its exponent over time $\\ alpha_{TFS}(t)$. To this end\, we first show how the probability of transi tion between two states of a stochastic variable $x(t)$ can be expressed o nce it is known its cumulant generating function $H(p)$. Thus\, introducin g a non-linear term in cumulant generating function $\\mathcal{H}^{(n)}(p\ ,t\;\\gamma)$ leads to a model where the n-th moment of the probability di stribution evolves arbitrarily. Subsequently\, in order to reproduce the t emporal fluctuation scaling\, a linear combination of $\\mathcal{H}^{(n)}( p\,t\;\\gamma)$ with $n\\in\\{1\,2\\}$ is used. Therefore\, this allows de scribing how the mean $M_{1}(t)$ and the variance $\\Xi_{2}(t)$ of empiric al time series evolve. Thence\, an analytical expression is deduced for th e evolution of the temporal evolution of the temporal fluctuation scaling exponent $\\alpha_{TFS}(t)$. Additionally\, this approach is verified in d ifferent financial time series with a daily frequency.\n\nhttps://fisindic o.uniandes.edu.co/event/15/contributions/161/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/161/ END:VEVENT BEGIN:VEVENT SUMMARY:A generalised model for noise propagation in transcriptional genet ic cascades. DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-154@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan David Marmolejo Lozano (Universidad de los Ande s)\nCellular processes are inherently stochastic\, leading to protein leve l variations and gene expression fluctuations known as noise. Accurately u nderstanding how noise spreads within gene networks is vital for creating gene circuits capable of withstanding noise and for comprehending signal r eliability in biological networks. However\, current models focusing on no ise propagation are often limited to specific systems or short gene cascad es. In response\, we developed a novel model for noise propagation in gene expression using Langevin approach\, applicable to networks comprising nu merous genes\, while considering the impact of the intracellular environme nt on gene expression. Our model offers a more comprehensive depiction of gene networks and proves valuable in the design of synthetic biological ci rcuits in bacteria\; moreover\, it may shed light on how evolutionary proc esses shape circuit sizes to achieve both signal fidelity and cellular fun ctionality.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/15 4/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/154/ END:VEVENT BEGIN:VEVENT SUMMARY:Reaction-Diffusion Models as an optimal search mechanism in comple x semantic networks DTSTART;VALUE=DATE-TIME:20231005T224000Z DTEND;VALUE=DATE-TIME:20231005T230000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-157@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Gustavo Espinosa Otalora (Universidad pedagógica y tecnológica de Colombia)\nVerbal fluency tests provide some insight into memory information and retrieval processes. These tests can be represented as a complex network\, where the nodes are the words of the fluency test and the links between nodes are the semantic relationship of the words. Th e complex network formed in this way has been called a “semantic network ”. To decipher the search mechanisms used by the brain in retrieving inf ormation from memory\, various search models have been proposed on the sem antic network\, in order to reproduce said network and identify the inform ation retrieval mechanism. Among the various models\, we highlight the cen sored random walker with priming vector (CRW+PV)\, which better reproduces the processes of sub-category changes in the category of the verbal fluen cy test. We tested a new model\, based on the reaction-diffusion model (R- D)\, initially worked on by Alan Turing\, who applied it to chemical proce sses where characteristic patterns were observed\, which were called Turin g patterns. The particular reaction-diffusion model has been implemented i n complex networks of neurons that define the connectome of the animal bra in. The model makes it possible to show neural patterns and the movement o f water in brain tissue. The application of the R-D model in complex netwo rks made it possible to implement it in the semantic network of verbal flu ency tests as a new search mechanism and compare it qualitatively with the results of the CRW+PV mechanism. A correlation was observed between the p atterns of the R-D model and the results of the CRW+PV mechanism.\n\nhttps ://fisindico.uniandes.edu.co/event/15/contributions/157/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/157/ END:VEVENT BEGIN:VEVENT SUMMARY:Mesoscopic heat engines: Protocols and their characterization DTSTART;VALUE=DATE-TIME:20231005T222000Z DTEND;VALUE=DATE-TIME:20231005T224000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-164@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Daniel Felipe Vargas Castillo (Universidad de los An des)\nThe idea of a heat engine proposed by thermodynamics has been a grea t achievement in the development of classical physics. Based on this conce pt\, mesoscopic heat engines were derived\, which operate at micro-scales where thermal fluctuations acquire an important role for modeling the syst em. In consequence\, the system must be modeled following a probabilistic point of view\, as suggested by stochastic thermodynamics. A mesoscopic he at engine of big interest is a colloidal particle immersed in a thermal ba th trapped with optical tweezers. This type of systems operate at the non- equilibrium regime and in finite times\, thus numerous protocols have been developed to maximize the power and efficiency of this thermal engines. T his thesis analyzes three different protocols for mesoscopic thermal engin es based on Carnot's cycle. First\, it gives an introduction to comprehend thermal fluctuations. Following\, it provides a detailed description on t he derivation of each protocol. Based on the latest\, each protocol was si mulated in order to obtain work and heat distributions\, as well as the ef ficiency an power by fixing the cycle's time duration. It was found that t he protocol that best reproduces the adiabatic processes is the third prot ocol. Moreover\, the third protocol optimize the delivered power. Last but no least\, the second protocol has a greater efficiency among the other p rotocols. Finally\, it was concluded that the second or the third protocol should be implemented taking into account the specific requirements neede d for the delivered power and efficiency.\n\nhttps://fisindico.uniandes.ed u.co/event/15/contributions/164/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/164/ END:VEVENT BEGIN:VEVENT SUMMARY:Liouville's theorem\, three converging points of view in mechanica l and statistical physics DTSTART;VALUE=DATE-TIME:20231005T220000Z DTEND;VALUE=DATE-TIME:20231005T222000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-169@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Irene Sánchez Arroyave (Universidad Distrital Franc isco José de Caldas)\nThe proof of Liouville's theorem is important in st atistical physics because it establishes a fundamental principle in the th eory of dynamical systems and statistical thermodynamics. Liouville's theo rem states that in a conservative system (where the total energy is conser ved)\, the volume in phase space occupied by a set of initial conditions i s also conserved over time. Starting from three points of view\, relevant considerations and postulates are collected\, such as the phase space as a dynamic entity that flows following the laws of mechanics\; the generaliz ation of Louiville's theorem to non-Hamiltonian systems\, such as dissipat ive systems\, taking the invariance of the Jacobian\; or reaching the Poin caré-Cartan Integral Invariant\, incorporating the symplectic geometry to the phase space and the principle of minimum action.\nThe present work is framed in the pertinence of making a revision of the concepts even to arr ive at the same proof of a theorem\, by revisiting its proof and underlyin g concepts\, physicists ensure the validity of this fundamental principle in the ever-evolving landscape of physical theories. It reaffirms the robu stness of this principle and its applicability to a wide range of systems. \n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/169/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/169/ END:VEVENT BEGIN:VEVENT SUMMARY:Uniaxial Anisotropy in MnAlCu systems DTSTART;VALUE=DATE-TIME:20231005T214000Z DTEND;VALUE=DATE-TIME:20231005T220000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-170@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Mily Sánchez (Universidad de los Andes)\nMnAlCu sys tems has shown enormous potential as permanent magnets due to their magnet ic properties\, which is why their characterization study has been carried out. During this research\, uniaxial anisotropy was discover using FORC d iagrams\, which showed different uncentered boomerang shapes that varied d epending on the percentage of doping. Furthermore\, in order to understand their domains behavior\, other data were taken using different techniques . MFM images were taken by changing the total magnetization of the sample\ , and SEM images were taken with the samples being demagnetized. Finally\, to prove that the magnetic properties change depending on the exposure an gle\, additional Hysteresis and FORC data were taken by varying the angle. \nThe obtained results showed an interacting single domain behavior with a negative average interacting field\, a mostly flat surface with some rou ghness at the preferred angle for the anisotropy\, and a preferred directi on for most domains.\n\nhttps://fisindico.uniandes.edu.co/event/15/contrib utions/170/ LOCATION:Universidad Nacional de Colombia Edificio 405 URL:https://fisindico.uniandes.edu.co/event/15/contributions/170/ END:VEVENT BEGIN:VEVENT SUMMARY:Random walks on networks with preferential cumulative damage: Gene ration of bias and aging DTSTART;VALUE=DATE-TIME:20231005T202000Z DTEND;VALUE=DATE-TIME:20231005T204000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-152@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Leidy Katherin Eraso Hernandez (Universidad Nacional Autónoma de México)\nIn this paper\, we explore the reduction of functi onality in a complex system as a consequence of cumulative random damage a nd imperfect reparation\, a phenomenon modeled as a dynamical process on n etworks. We analyze the global characteristics of the diffusive movement o f random walkers on networks where the walkers hop considering the capacit y of transport of each link. The links are susceptible to damage that gene rates bias and aging. We describe the algorithm for the generation of dama ge and the bias in the transport producing complex eigenvalues of the tran sition matrix that defines the random walker for different types of graphs \, including regular\, deterministic\, and random networks. The evolution of the asymmetry of the transport is quantified with local information in the links and further with non-local information associated with the trans port on a global scale such as the matrix of the mean first passage times and the fractional Laplacian matrix. Our findings suggest that systems wit h greater complexity live longer.\n\nhttps://fisindico.uniandes.edu.co/eve nt/15/contributions/152/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/152/ END:VEVENT BEGIN:VEVENT SUMMARY:Emergent properties of chess openings DTSTART;VALUE=DATE-TIME:20231005T200000Z DTEND;VALUE=DATE-TIME:20231005T202000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-138@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Rafael Hurtado (Universidad Nacional de Colombia)\nC hess is a board game that demands deep positional understanding from the f irst move of the opening to the end of the game. Here\, we present a metho d for assessing the true intentions of chess players in their opening move \, which is often considered to be the most crucial decision in a match. W e use a hidden variables formalism developed for complex networks\, and ou r findings include a study of relevant grandmasters as well as an identifi cation of the role of asymmetries between white and black pieces throughou t history.\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/138 / LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/138/ END:VEVENT BEGIN:VEVENT SUMMARY:Discrete-time random walks with stochastic restart on networks: wh en resetting becomes advantageous? DTSTART;VALUE=DATE-TIME:20231005T194000Z DTEND;VALUE=DATE-TIME:20231005T200000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-137@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Alejandro Pérez Riascos (Universidad Nacional de Co lombia)\nWhen a discrete-time process on a network is stochastically broug ht back from time to time to its starting node\, the mean search time need ed to reach another node of the network may be significantly decreased. In other cases\, however\, resetting is detrimental to search. Using the eig envalues and eigenvectors of the transition matrix defining the process wi thout resetting\, we derive a general criterion for finite networks that e stablishes when there exists a non-zero resetting probability that minimiz es the mean first passage time (MFPT) at a target node. We apply these res ults to the study of optimal transport on different structures including d eterministic and random networks.\n\nhttps://fisindico.uniandes.edu.co/eve nt/15/contributions/137/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/137/ END:VEVENT BEGIN:VEVENT SUMMARY:Urban traffic dynamics through the lens of percolation theory DTSTART;VALUE=DATE-TIME:20231005T192000Z DTEND;VALUE=DATE-TIME:20231005T194000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-149@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Luis Eduardo Olmos (Universidad de Medellín)\nThre e short stories will be used to illustrate how percolation theory can be u sed to diagnose and understand some of the urban mobility problems that ar e faced today by some of the world’s cities. All the stories have in com mon that they address how the local flows in the roads are organized colle ctively into a global city flow. The third story characterizes this organi zation process of traffic as traffic percolation where the giant cluster o f local flows disintegrates when the second largest cluster reaches its ma ximum. Traffic percolation thus opens a new approach in network and transp ortation science. The talk will discuss how combining traffic percolation with the conventional approaches can open up insightful avenues for resear ch aimed at alleviating traffic congestion in our cities.\n\nhttps://fisin dico.uniandes.edu.co/event/15/contributions/149/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/149/ END:VEVENT BEGIN:VEVENT SUMMARY:How we move in the city: some results of the analysis of complex m obility networks DTSTART;VALUE=DATE-TIME:20231005T190000Z DTEND;VALUE=DATE-TIME:20231005T192000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-144@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Laura Lotero (Universidad Nacional de Colombia\, sed e Medellín)\nUrban mobility is a critical variable in urban planning. Und erstanding mobility patterns support decision-making processes at the city level. This talk shows how representing the movement flows of people in t he city through networks and using concepts and tools derived from statist ical physics and complex networks allow us to identify interesting pattern s. Some results regarding differences and diversity in the mobility patter ns according to socioeconomic status or gender of the traveler are present ed. Finally\, some applications of the different mobility patterns in dise ase spread dynamics are discussed.\n\nhttps://fisindico.uniandes.edu.co/ev ent/15/contributions/144/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/144/ END:VEVENT BEGIN:VEVENT SUMMARY:Generalized fractional Feynman-Kac formula DTSTART;VALUE=DATE-TIME:20231005T165000Z DTEND;VALUE=DATE-TIME:20231005T171000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-162@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Felipe Segundo Abril Bermúdez (Universidad Nacional de Colombia)\nMost stochastic processes are solved by knowing the probabi lity distribution of the process increments or the transition probability distribution that satisfies a Fokker-Planck equation. Also\, a rather inte resting and known application of stochastic processes is in the Feynman-Ka c formula\, which presents the equivalence of parabolic partial differenti al equation problems and stochastic processes under the Feynman path integ ral. Specifically\, it has been shown that the Feynman-Kac formula is noth ing more than the Fokker-Planck equation associated with the process but w ith "final" conditions instead of initial conditions. Then\, we generalize the Feynman-Kac formula for an arbitrary additive stochastic process with a right-handed fractional Riemann-Liouville integral of order $H-1/\\alph a+1$ with $H$ the Hurst exponent. To this end\, we start from the evolutio n equation of a fractional stable process of order $H-1/\\alpha+1$ and its stochastic component is modified with an arbitrary noise $\\eta(t)$ to ob tain a fractional Langevin equation. Thence\, making use of the path integ ral formalism\, an expression is deduced for the transition probability be tween two states of the stochastic process in terms of the noise cumulant generating function denoted by $H(p)$. Furthermore\, the entire formalism is held in terms of the It\\^{o} and Stratonovich calculus by a parameter $\\gamma\\in[0\,1]$. Next\, the extension of the Feynman-Kac formula is ma de for the fractional Langevin equation by deriving the Fokker-Planck equa tion of the underlying stochastic process in terms of the cumulant generat ing function. Additionaly\, the Feynman-Kac formula is deduced in the part icular case of a truncated Lévy distribution.\n\nhttps://fisindico.uniand es.edu.co/event/15/contributions/162/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/162/ END:VEVENT BEGIN:VEVENT SUMMARY:Burr distribution in voting and asymmetric additive stochastic pro cess DTSTART;VALUE=DATE-TIME:20231005T163000Z DTEND;VALUE=DATE-TIME:20231005T165000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-159@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Alejandro Riascos Ochoa (Universidad Nacional de Col ombia)\nThe distribution by regions of electoral voting is frequently stud ied in the sociopolitical field. Making use of the databases on presidenti al and congressional voting reported by the Registraduria NAcional del Est ado Civil (RNEC) in Colombia\, by the Servicio Electoral de Chile (SERVEL) and by the Instituto Nacional Electoral (INE) in Mexico\, it is found tha t the votes obtained in properly established regions are distributed among municipalities for each of the electoral options following a Burr distrib ution pattern. Complementarily in this work\, the generation of Burr distr ibution patterns is shown through a kinetic exchange model associated with an asymmetric additive stochastic process for two agents\, which will est ablish the bases for a modeling of the previously mentioned voting results .\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/159/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/159/ END:VEVENT BEGIN:VEVENT SUMMARY:Competition between convergence and conviction in a kinetic model of opinion formation with limited influence DTSTART;VALUE=DATE-TIME:20231005T161000Z DTEND;VALUE=DATE-TIME:20231005T163000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-155@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jefferson Rubiano Forero (Universidad Nacional de Co lombia)\nThe kinetic model of opinion formation by Deffuant-Neau-Amblard-W eisbush (DNAW)\, one of the most well-known in sociophysics\, describes th e process of opinion formation towards consensus or homogeneous opinions. This is done by considering exchanges of opinion between pairs of agents\, in such a way that these exchanges have limited influence as they are con fined within a range of opinion and depend on a parameter called "converge nce\," which takes values between 0 and 0.5. In this work\, we propose a k inetic model of opinion formation\, which generalizes the DNAW model by in cluding a parameter of "conviction" that allows describing the opinion for mation process in terms of the competition between convergence and convict ion. We show that the number of time steps required to reach opinion conse nsus depends not only on the parameters of range and conviction but also o n the convergence parameter. In this model\, the convergence parameter now takes values between 0 and 1. Additionally\, we demonstrate the existence of opinion phase transitions\, observed through the variation of the aver age opinion. Finally\, we show that this model can generate patterns of he terogeneous opinion distribution\, in addition to the homogeneous patterns that are characteristic of the DNAW model.\n\nhttps://fisindico.uniandes. edu.co/event/15/contributions/155/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/155/ END:VEVENT BEGIN:VEVENT SUMMARY:Statistical mechanics of the exchange kinetic models associated wi th additive and multiplicative stochastic processes DTSTART;VALUE=DATE-TIME:20231005T155000Z DTEND;VALUE=DATE-TIME:20231005T161000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-139@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos José Quimbay Herrera (Universidad Nacional d e Colombia)\nIn this work we present a statistical mechanics perspective f or two simple kinetic models in which the exchange rules between an agent pair selected stochastically differ in which\, for the first model\, the q uantity conserved in the exchange is the sum of the respective quantities that the two agents have before and after the exchange\, and for the secon d model the quantity conserved is the product of the quantities of the two agents. For the first kinetic model\, the distribution patterns obtained by numerical simulations are normals\, while for the second kinetic model the distributions are lognormals. If a lower boundary condition is imposed on the underlying additive stochastic process of the first model\, a Bolt zmann exponential distribution is obtained. Analogously\, if a lower bound ary \ncondition is imposed on the underlying multiplicative stochastic pro cess of the second model\, a power-law distribution is obtained. For both models without boundary conditions\, we show how the fit parameters depend on the number of time steps of the simulations and the exogen parameters involved in the exchange rules.\n\nhttps://fisindico.uniandes.edu.co/event /15/contributions/139/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/139/ END:VEVENT BEGIN:VEVENT SUMMARY:Citizen environmental governance: reconstructing through network analysis the dynamics of the social movement in the Páramo de Santurbán DTSTART;VALUE=DATE-TIME:20231005T144000Z DTEND;VALUE=DATE-TIME:20231005T150000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-148@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Gabriel Villalobos (Escuela Superior de Administraci ón Pública)\nThe biodiverse triangle of Santurban and Berlin\, in northe rn Colombia\, has been in the center of an environmental conflict since th e 90s. Gold mining corporations\, national and local governments and its i nhabitants are clashing over economic development and the protection of th e main source of water for more than 3 million people. Colombian legal fra mework provides individuals and communities with a set of tools to safegua rd individual and communal rights. However\, small communities face two la rge difficulties\, on one side they usually lack the resources to set up l egal teams\; and on the other hand\, the final decision by higher courts c an be influenced by the public opinion. In this context it is paramount fo r both sides of the argument to control the narrative of public opinion. T o understand this phenomenon\, we scraped data out of twitter and built a network model for the ambientalist struggle of Santurbán over the last 10 years. The period of analysis coincides with\, first\, the existence of a civic organization called Comité para la defensa del agua y del Páramo de Santurbán\, formed by social leaders\, peasants and inhabitants of the region\; and\, second\, the extent of the use of social networks as Twitt er. The dynamics of our network model provides information on how the move ment has shifted the narrative and strengthened the ties with other extern al actors forming an environmental coalition\, and forced gold mining comp anies to drop the request of exploiting gold licenses.\n\nhttps://fisindic o.uniandes.edu.co/event/15/contributions/148/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/148/ END:VEVENT BEGIN:VEVENT SUMMARY:Exploration mechanisms intrinsic to semantic networks and the nuan ced appraisal of lexical repetition occurrences DTSTART;VALUE=DATE-TIME:20231005T142000Z DTEND;VALUE=DATE-TIME:20231005T144000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-141@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Fernando Naranjo Mayorga (Universidad pedagógica y tecnológica de Colombia)\nThe use of cognitive assessments aids in identi fying notable impairments\, especially within cases involving the frontal lobe\, as well as instances of neurodegenerative disorders like Alzheimer' s\, Parkinson's\, and semantic dementia\, among other pathologies.\nThis s tudy concentrates on semantic memory\, a crucial facet of cognitive storag e responsible for integrating language and concepts acquired through every day experiences. The conceptualization initiates by presenting memory as a complex semantic network\, fostering various investigative processes. The se processes' extent varies\, based on the global or localized exploration nature and the strategic direction. Employing a stochastic model known as the 'switching random walker model\,' it becomes feasible to emulate lexi cal searches within semantic networks. This model induces a diffusive proc ess\, characterized by Markov chains\, within the network. Evaluating the efficiency and performance of these networks is accomplished through the u tilization of rate entropy and the initial mean passage time.\nAdditionall y\, a unique approach introduces a fluency test model aimed at probing the correlation between short-term memory and the predisposition for lexical repetition. Instances of lexical repetition arise during tasks necessitati ng semantic verbal fluency\, wherein individuals may inadvertently produce reiterated words. This situation encompasses contemplating a word through semantic network traversal\, leading to the inability to ascertain if the word was previously uttered.\nThis research strives to bridge the gap bet ween analyzing exploration mechanisms inherent to semantic networks and th e intricate evaluation of lexical repetition incidents. To this end\, a fu sion is realized\, encapsulating: i) The topological features characterizi ng the foundational semantic network\; ii) Mechanisms of exploratory behav ior rooted in switching dynamics and clustering modalities\; and iii) The dimensions of short-term memory\, embodied as a first-in\, first-out buffe r of defined proportions\, proficient in retaining the most recently artic ulated lexical elements."\n\nhttps://fisindico.uniandes.edu.co/event/15/co ntributions/141/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/141/ END:VEVENT BEGIN:VEVENT SUMMARY:Exploring the glassy dynamics of the Gaussian core model DTSTART;VALUE=DATE-TIME:20231005T140000Z DTEND;VALUE=DATE-TIME:20231005T142000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-136@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Manuel Camargo (Facultad de Ciencias & CICBA\, Unive rsidad Antonio Nariño)\nWe study the supercooled dynamics of the Gaussian Core Model in the low- and intermediate-density regimes by means of molec ular dynamics simulations. In particular\, we discuss the transition from the low-density hard-sphere-like glassy dynamics to the high-density one. The caging mechanism describes the dynamics at low densities well\, giving rise to intermittent dynamics. At high densities\, the particles undergo a more continuous motion in which the cage concept loses meaning. We elabo rate on the idea that these different supercooled dynamics are in fact the precursors of two different glass states.\n\nhttps://fisindico.uniandes.e du.co/event/15/contributions/136/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/136/ END:VEVENT BEGIN:VEVENT SUMMARY:Frustrated Bearings DTSTART;VALUE=DATE-TIME:20231005T133000Z DTEND;VALUE=DATE-TIME:20231005T140000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-143@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Hans Herrmann (PMMH\, ESPCI Paris\, France and UFC\, Fortaleza\, Brazil)\nA bearing is a system of spheres (or disks) in conta ct. If in a bearing every loop must be even\, one can obtain “bearing st ates”\, in which touching spheres roll on each other without slip. We fr ustrate a system of touching spheres by imposing two different bearing st ates on opposite sides and search for the configurations of lowest energy dissipation. For Coulomb friction (with random friction coefficients) in two dimensions\, a sharp line separates the two bearing states and we prov e that this line corresponds to the minimum cut. Astonishingly however\, i n three dimensions\, intermediate bearing domains\, that are not synchroni zed with either side\, are energetically more favourable than the minimum- cut surface. This novel state of minimum dissipation is characterized by a spanning network of slip-less contacts that reaches every sphere. Such a situation becomes possible because in three dimensions bearings of loops o f size four have four degrees of freedom. By considering spheres of differ ent size\, packings with bearing states can even be made space-filling. Th e construction and mechanical properties of such space-filling bearings wi ll be discussed. Space-filling bearing states can be viewed as a realizati on of solid turbulence exhibiting Kolmogorov scaling and anomalous heat co nduction. Bearings states can be perceived as physical realizations of net works of oscillators with asymmetrically weighted couplings. These network s can exhibit optimal synchronization properties through tuning of the loc al interaction strength as a function of node degree or the inertia of the ir constituting rotor disks through a power-law mass-radius relation. As a consequence\, one finds that space filling bearings synchronize fastest\, when they are hollow.\n\nhttps://fisindico.uniandes.edu.co/event/15/contr ibutions/143/ LOCATION:Universidad Nacional de Colombia A1 - edificio 564 URL:https://fisindico.uniandes.edu.co/event/15/contributions/143/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum thermodynamics: fluctuations and thermal machines DTSTART;VALUE=DATE-TIME:20231002T210000Z DTEND;VALUE=DATE-TIME:20231002T223000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-180@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Gonzalo Manzano (Instituto de Física Interdisciplin ar y Sistemas Complejos - IFISC (CSIC-UIB))\nIn the last decades thermodyn amics have been extended to small (microscopic or nanoscopic) scales\, whe re fluctuations play a major role pushing systems out of equilibrium\, and where genuine quantum effects cannot be neglected anymore. Quantum thermo dynamics is an interdisciplinary and growing field that places at the inte rsection of quantum information and non-equilibrium statistical physics. I t aims to study quantum systems from a new perspective\, emphasizing the e nergetic and entropic costs of quantum operations\, and investigating poss ible enhancements of classical thermodynamic tasks by means of genuine qua ntum effects.\n\nIn this mini-course I will introduce some of the main con cepts in quantum thermodynamics\, including the definitions of work\, heat or entropy production at the quantum level\, but also some of their appli cations\, such as designing quantum thermal machines that perform useful t hermodynamic tasks. For that purpose I will introduce some basics of open and monitored quantum systems\, that will allow us to describe fluctuation s of relevant thermodynamic quantities in generic quantum processes. Using these tools we will also see how to derive universal results such as the so-called fluctuation theorems\, as well as other related inequalities\, a ltogether refining our understanding of the second law and irreversibility .\n\nhttps://fisindico.uniandes.edu.co/event/15/contributions/180/ LOCATION:Universidad de los Andes SD-805 URL:https://fisindico.uniandes.edu.co/event/15/contributions/180/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent Advances in Percolation Theory DTSTART;VALUE=DATE-TIME:20231002T153000Z DTEND;VALUE=DATE-TIME:20231002T170000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-179@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Hans Herrmann (PMMH\, ESPCI Paris\, France and UFC\, Fortaleza\, Brazil)\nIn the course we will first introduce the basic conc epts of percolation\, its scaling laws and its fractal subsets like the ba ckbone\, the elastic backbone\, the shortest path with its perturbations a nd the distribution of currents. We will also present rigidity percolation \, bootstrap percolation and drilling percolation. Particular emphasis wil l be given to discontinuous percolation like explosive and bridge percolat ion as well as abrupt epidemic spreading. Next\, we will consider correlat ed surfaces with Hurst exponents to study the fractality of its coastlines \, its watersheds and its retention capacity. We will investigate the Schr amm-Loewner Evolution of various loop-less curves on top of these surfaces . We will dedicate the end of the course to failure models\, like the fuse model\, metallic breakdown and the optimal path crack.\n\nhttps://fisindi co.uniandes.edu.co/event/15/contributions/179/ LOCATION:Universidad de los Andes SD-805 URL:https://fisindico.uniandes.edu.co/event/15/contributions/179/ END:VEVENT BEGIN:VEVENT SUMMARY:Control theory and stochastic thermodynamics DTSTART;VALUE=DATE-TIME:20231002T190000Z DTEND;VALUE=DATE-TIME:20231002T203000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-178@fisindico.uniandes.edu.co DESCRIPTION:Speakers: John Bechhoefer (Simon Fraser University)\nControl t heory is an important topic for physicists that rarely is covered by stand ard curricula. In these three sessions\, I will introduce the main ideas a nd discuss basic ideas such as feedback\, feedforward\, and robustness and how they apply to stochastic thermodynamics.\n\n* Session 1 will introduc e control theory as a whole and motivate its interest and value to physici sts\, both for practical reasons (e.g. improving experiments\, e.g. via PI D feedback) and theoretical reasons (e.g. its connections with information theory and thermodynamics).\n* Session 2 will focus on optimal control\, including Hamiltonian methods and Pontryagin’s principle\, and discuss i ts application to stochastic systems.\n* Session 3 will focus on state est imation\, including Bayesian and Kalman filters\, and show that many pract ical problems in the treatment of experiment have in common the need to in fer “hidden” dynamical states from a sequence of measurements.\n\nhttp s://fisindico.uniandes.edu.co/event/15/contributions/178/ LOCATION:Universidad de los Andes SD-805 URL:https://fisindico.uniandes.edu.co/event/15/contributions/178/ END:VEVENT BEGIN:VEVENT SUMMARY:Registration DTSTART;VALUE=DATE-TIME:20231002T140000Z DTEND;VALUE=DATE-TIME:20231002T150000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-177@fisindico.uniandes.edu.co DESCRIPTION:https://fisindico.uniandes.edu.co/event/15/contributions/177/ LOCATION:Universidad de los Andes SD-805 URL:https://fisindico.uniandes.edu.co/event/15/contributions/177/ END:VEVENT BEGIN:VEVENT SUMMARY:Opening DTSTART;VALUE=DATE-TIME:20231002T150000Z DTEND;VALUE=DATE-TIME:20231002T153000Z DTSTAMP;VALUE=DATE-TIME:20261017T090150Z UID:indico-contribution-15-176@fisindico.uniandes.edu.co DESCRIPTION:https://fisindico.uniandes.edu.co/event/15/contributions/176/ LOCATION:Universidad de los Andes SD-805 URL:https://fisindico.uniandes.edu.co/event/15/contributions/176/ END:VEVENT END:VCALENDAR