Symmetry in Statistical Mechanics and Complex Dynamical Systems

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 30 April 2024 | Viewed by 3661

Special Issue Editor


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Guest Editor
Department of Earth Physics and Thermodynamics, University of Valencia, E-46100 Burjassot, Spain
Interests: nonlinear dynamics and chaos; thermodynamics; statistical mechanics; fractals; wavelets; cellular automata; coupled map lattices; time-series analysis; spatiotemporal pattern formation; shape theory

Special Issue Information

Dear Colleagues,

Symmetry, entropy and action are, arguably, the three main concepts at the heart of physics. Although the connections between symmetry and action have been long explored and are still the subject of intense research nowadays (from Galilean invariance to Noether’s theorem and gauge field theories) those of symmetry and entropy, on one hand, and action and entropy, on the other, remain poorly understood.

The dynamical and statistical behavior of complex systems is strongly constrained by symmetry. For example, symmetry in nonlinear partial differential equations leads to drawing important conclusions on the sets of their possible spatiotemporal solutions thanks to the equivariance theorem. Other systems, such as cellular automata, allow the interplay between symmetry, complexity and entropy increase to be explored. The Second Law of Thermodynamics is already present in time-reversible cellular automata and the Loschmidt paradox admits an elegant solution in these systems in terms of the huge (computable) size of the sets of initial conditions that lead to an entropy increase compared to those that would lead to trajectories violating the Second Law.

This Special Issue highlights symmetry applications and consequences in the dynamical behavior of complex systems whose trajectories can be computationally or analytically studied, as well as those for which insight can be gained by statistical mechanical methods. Dynamical systems like cellular automata, coupled map lattices, systems of nonlinear differential equations and nonlinear partial differential equations will be explored paying special emphasis on those cases for which symmetry is helpful to establish structural features of the resulting attractors and complexity measures.

Dr. Vladimir García-Morales
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • cellular automata
  • coupled map lattices
  • nonlinear partial differential equations
  • entropy
  • partition function
  • complexity
  • nonlinear oscillators
  • exactly solved models
  • computer simulations

Published Papers (3 papers)

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Research

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14 pages, 329 KiB  
Article
Residual Tsallis Entropy and Record Values: Some New Insights
by Mansour Shrahili and Mohamed Kayid
Symmetry 2023, 15(11), 2040; https://doi.org/10.3390/sym15112040 - 10 Nov 2023
Cited by 1 | Viewed by 564
Abstract
Recently, the uncertainty aspects of record values have been increasingly studied in the literature. In this paper, we study the residual Tsallis entropy of upper record values coming from random samples. In the continuous case, we define the Tsallis entropy quantity for the [...] Read more.
Recently, the uncertainty aspects of record values have been increasingly studied in the literature. In this paper, we study the residual Tsallis entropy of upper record values coming from random samples. In the continuous case, we define the Tsallis entropy quantity for the residual lifetime of upper record values in general distributions as the residual Tsallis entropy of upper record values coming from a uniform distribution. We also obtain a lower bound on the residual Tsallis entropy of upper data set values originating from an arbitrary continuous probability distribution. We also discuss the monotonic property of the residual Tsallis entropy of upper data sets. Full article
(This article belongs to the Special Issue Symmetry in Statistical Mechanics and Complex Dynamical Systems)
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10 pages, 3765 KiB  
Article
Diffusion Properties of a Brownian Ratchet with Coulomb Friction
by Massimiliano Semeraro, Giuseppe Gonnella, Eugenio Lippiello and Alessandro Sarracino
Symmetry 2023, 15(1), 200; https://doi.org/10.3390/sym15010200 - 10 Jan 2023
Cited by 2 | Viewed by 1225
Abstract
The motion of a Brownian particle in the presence of Coulomb friction and an asymmetric spatial potential was evaluated in this study. The system exhibits a ratchet effect, i.e., an average directed motion even in the absence of an external force, induced by [...] Read more.
The motion of a Brownian particle in the presence of Coulomb friction and an asymmetric spatial potential was evaluated in this study. The system exhibits a ratchet effect, i.e., an average directed motion even in the absence of an external force, induced by the coupling of non-equilibrium conditions with the spatial asymmetry. Both the average motion and the fluctuations of the Brownian particle were analysed. The stationary velocity shows a non-monotonic behaviour as a function of both the temperature and the viscosity of the bath. The diffusion properties of the particle, which show several time regimes, were also investigated. To highlight the role of non-linear friction in the dynamics, a comparison is presented with a linear model of a Brownian particle driven by a constant external force, which allows for analytical treatment. In particular, the study unveils that the passage times between different temporal regimes are strongly affected by the presence of Coulomb friction. Full article
(This article belongs to the Special Issue Symmetry in Statistical Mechanics and Complex Dynamical Systems)
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Review

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23 pages, 353 KiB  
Review
Symmetries and Asymmetries in Branching Processes
by Imre Pázsit
Symmetry 2023, 15(6), 1154; https://doi.org/10.3390/sym15061154 - 26 May 2023
Viewed by 1312
Abstract
As is known in stochastic particle theory, the same random process can be described by two different master equations for the evolution of the probability density, namely, by a forward or a backward master equation. These are the generalised analogues of the direct [...] Read more.
As is known in stochastic particle theory, the same random process can be described by two different master equations for the evolution of the probability density, namely, by a forward or a backward master equation. These are the generalised analogues of the direct and adjoint equations of traditional transport theory. At the level of the first moment, these two equations show considerable resemblance to each other, but they become increasingly different with increasing moment order. The purpose of this paper is to demonstrate this increasing asymmetry and to discuss the underlying reasons. It is argued that since the reason of the different forms of the forward and the backward equations lies in the lack of invariance of the process to time reversal, the reason for the increasing asymmetry between the two forms for higher-order moments or processes with several variables (particle types) can be related to the increasing level of the violation of the invariance to time reversal, as is illustrated with some examples. Full article
(This article belongs to the Special Issue Symmetry in Statistical Mechanics and Complex Dynamical Systems)
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