4th Workshop on Statistical Physics

Sesión

Invited Talks

5 oct. 2023 9:00

A1 - edificio 564 (Universidad Nacional de Colombia)

Moderadores

Invited Talks

• Gabriel Téllez (Universidad de los Andes)

Invited Talks

• Gabriel Villalobos (Escuela Superior de Administración Pública)

Invited Talks

• Fernando Naranjo Mayorga (Universidad pedagógica y tecnológica de Colombia)

Invited Talks: Invited talks

• Juan Gabriel Ramirez (Universidad de los Andes)

Invited Talks: Invited talks

• Jose Daniel Muñoz Castaño (Departamento de Física, Universidad Nacional de Colombia, Bogotá)

Invited Talks: Invited talks

• Jose Daniel Muñoz Castaño (Departamento de Física, Universidad Nacional de Colombia, Bogotá)

Invited Talks: Invited talks

• Robert Salazar (Universidad ECCI)

Invited Talks

• Carlos Viviescas (Física Unal)

Descripción

Invited talks

Lista de contribución Cronograma

13. Exploring the glassy dynamics of the Gaussian core model

Dr Manuel Camargo (Facultad de Ciencias & CICBA, Universidad Antonio Nariño)

5/10/23 9:00

Statistical Physics

Invited talk

We study the supercooled dynamics of the Gaussian Core Model in the low- and intermediate-density regimes by means of molecular 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,...

18. Exploration mechanisms intrinsic to semantic networks and the nuanced appraisal of lexical repetition occurrences

Dr Fernando Naranjo Mayorga (Universidad pedagógica y tecnológica de Colombia)

5/10/23 9:20

Statistical Physics

Invited talk

The use of cognitive assessments aids in identifying 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.
This study concentrates on semantic memory, a crucial facet of cognitive storage responsible for integrating language and concepts...

39. Citizen environmental governance: reconstructing through network analysis the dynamics of the social movement in the Páramo de Santurbán

Dr Gabriel Villalobos (Escuela Superior de Administración Pública)

5/10/23 9:40

Statistical Physics

Invited talk

The biodiverse triangle of Santurban and Berlin, in northern Colombia, has been in the center of an environmental conflict since the 90s. Gold mining corporations, national and local governments and its inhabitants are clashing over economic development and the protection of the main source of water for more than 3 million people. Colombian legal framework provides individuals and communities...

30. Distinguishability versus Indistinguishability of Agents in Metapopulation Epidemic Models

Prof. Jesús Gómez Gardeñes (Universidad de Zaragoza)

5/10/23 10:30

Statistical Physics

Invited talk

The analysis of contagion-diffusion processes in metapopulations is a powerful theoretical tool to study how mobility influences the spread of communicable diseases. Here we address the impact that recurrent patterns of mobility, and the spatial distribution of distinguishable agents, have on the development of epidemics in large urban areas. We incorporate the distinguishable nature of agents...

7. Statistical mechanics of the exchange kinetic models associated with additive and multiplicative stochastic processes

Prof. Carlos José Quimbay Herrera (Universidad Nacional de Colombia)

5/10/23 10:50

Statistical Physics

Invited talk

In this work we present a statistical mechanics perspective for two simple kinetic models in which the exchange rules between an agent pair selected stochastically differ in which, for the first model, the quantity conserved in the exchange is the sum of the respective quantities that the two agents have before and after the exchange, and for the second model the quantity conserved is the...

29. How we move in the city: some results of the analysis of complex mobility networks

Dr Laura Lotero (Universidad Nacional de Colombia, sede Medellín)

5/10/23 14:00

Statistical Physics

Invited talk

Urban mobility is a critical variable in urban planning. Understanding mobility patterns support decision-making processes at the city level. This talk shows how representing the movement flows of people in the city through networks and using concepts and tools derived from statistical physics and complex networks allow us to identify interesting patterns. Some results regarding differences...

46. Urban traffic dynamics through the lens of percolation theory

Dr Luis Eduardo Olmos (Universidad de Medellín)

5/10/23 14:20

Statistical Physics

Invited talk

Three short stories will be used to illustrate how percolation theory can be used to diagnose and understand some of the urban mobility problems that are faced today by some of the world’s cities. All the stories have in common that they address how the local flows in the roads are organized collectively into a global city flow. The third story characterizes this organization process of...

15. Discrete-time random walks with stochastic restart on networks: when resetting becomes advantageous?

Dr Alejandro Pérez Riascos (Universidad Nacional de Colombia)

5/10/23 14:40

Statistical Physics

Invited talk

When a discrete-time process on a network is stochastically brought back from time to time to its starting node, the mean search time needed to reach another node of the network may be significantly decreased. In other cases, however, resetting is detrimental to search. Using the eigenvalues and eigenvectors of the transition matrix defining the process without resetting, we derive a general...

16. Emergent properties of chess openings

Prof. Rafael Hurtado (Universidad Nacional de Colombia)

5/10/23 15:00

Statistical Physics

Invited talk

Chess is a board game that demands deep positional understanding from the first move of the opening to the end of the game. Here, we present a method 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. We use a hidden variables formalism developed for complex networks, and our findings include a study...

21. Numerical integration of a class of stochastic differential equations with singular coefficients

Dr Sergio Andraus (Tsukuba Gakuin University)

6/10/23 9:00

Statistical Physics

Invited talk

The simulation of stochastic systems is a valuable tool to investigate a broad range of topics, from atomistic simulations of colloidal systems and magnetic materials to the simulation of interest rates and derivatives in mathematical finance. In most cases, these systems are simulated by integrating the corresponding stochastic differential equations (SDEs) via the Euler-Maruyama, Milstein or...

10. One-particle engine with a porous piston

Dr Carlos Alvarez (Tec Monterey)

6/10/23 9:20

Statistical Physics

Invited talk

A 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 piston from the engine, nor measure the position of the particle for the engine to do work. The dissipation on energy occurs when the mass over which the...

3. Physical properties driven by phase separation in electron-correlated materials: percolation and avalanches.

Prof. Juan Gabriel Ramirez (Universidad de los Andes)

6/10/23 10:30

Statistical Physics

Invited talk

Strongly 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 competing phases, which manifests in diverse phenomena including metal-insulator transitions, multiple magnetic transitions, and structural phase transitions. In some instances,...

55. 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 percolation

Prof. Andrés Rosales Rivera (Universidad Nacional de Colombia, Manizales)

6/10/23 11:30

Statistical Physics

Invited talk

12. Comparative Analysis of Surface Charge Density in Planar Metallic Layers: Molecular Dynamics and Method of Moments Approach for Long-Range Interactions

Dr Robert Salazar (Universidad ECCI)

6/10/23 11:50

Statistical Physics

Invited talk

In 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 dynamics simulations to find the system's positional correlation functions and velocity distributions by modeling it as a two-dimensional Coulomb plasma in the liquid phase. Alternatively, the surface charge density is calculated by...

38. Work and heat in weakly measured quantum systems: The way you measure matters.

Prof. Carlos Viviescas (Universidad Nacional de Colombia)

6/10/23 14:40

Statistical Physics

Invited talk

In quantum thermodynamics, fluctuation theorems provide a way for the quantification of irreversibility of single trajectories. In this work we propose a description of the dynamics of single trajectories based on an M-parametrization 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...

32. Beyond molecular kinetics: statistical physics methods in systems biology

Prof. Juan Manuel Pedraza (Departamento de Física, Universidad de los Andes)

6/10/23 16:00

Statistical Physics

Invited talk

Basic methods of statistical physics have proven extremely useful in the modelling of enzyme dynamics, but now the concepts of 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 overview of the use of the concepts (more than the...

53. Bayesian analysis of free energies using Cryo-EM particle images

Dr Pilar Cossio (Flatiron Institute)

6/10/23 16:20

Statistical Physics

Invited talk

Cryo-electron microscopy (cryo-EM) has recently become a leading method for obtaining high-resolution structures of biological macromolecules. However, cryo-EM is limited to biomolecular samples with low conformational heterogeneity, where most conformations can be well-sampled at various projection angles.
While cryo-EM provides single-molecule data for heterogeneous molecules, most existing...

52. Explaining the complexity of Colombian climate from the non-extensive extremal behavior

Prof. Isabel Cristina Hoyos (Universidad del Quindio)

6/10/23 16:40

Statistical Physics

Invited talk

The Tsallis’ non-extensive statistical mechanics is a generalized framework for describing complex systems where ergodicity (and statistical equilibrium as its macroscopic manifestation) is just one of the dynamic possibilities of microscopical mixing. In practical manners, the generalization from Tsallis’ theory introduces a non-extensive entropic functional Sq through the q-index, which...

54. Determination of the free energy landscape of ultrasmall silver clusters with metadynamics and machine learning techniques

Prof. Olga López-Acevedo (Universidad de Antioquia)

6/10/23 17:00

Statistical Physics

Invited talk

Ab initio metadynamics enables the extraction of free energy landscapes with the precision of first-principles electronic structure methods. We developed and used an interface between the PLUMED and ASE codes to estimate the free 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...

23. Steady state of a two-species annihilation process with separated reactants

Prof. Diego Luis Gónzalez (Universidad del Valle)

6/10/23 17:20

Invited talk

We describe the steady state of the annihilation process of a one-dimensional system of two initially separated reactants A and B. The parameters that define the dynamical behavior of the system are the diffusion constant, the reaction rate, and the deposition rate. Depending on the ratio between those parameters, the system exhibits a crossover between a diffusion-limited (DL) regime and a...