Article
Mechanics
David Martin, Thibaut Arnoulx de Pirey
Summary: By focusing on a small persistence time limit, this study analyzes the steady-state distribution of an active Ornstein Uhlenbeck particle (AOUP) subjected to Gaussian white noise and self-propulsion. Analytical formulas are derived for the spatial density of a confined particle, the current induced by an asymmetric periodic potential, and the entropy production rate, revealing the impact of passive and active noises on the non-equilibrium behavior of AOUPs as temperature varies. The study also highlights how the particle's distance from equilibrium can be influenced by translational diffusion, depending on the context and the steepness of the confining potentials.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Sushanta Dattagupta, Debraj Das, Shamik Gupta
Summary: In this work, we study the problem of quantum unitary dynamics interspersed at random times with stochastic resets in the framework of a driven tight-binding chain. We find that the driven TBC particle exhibits remarkable localization on the lattice sites at long times, and we show that localization can also be induced by subjecting the system to stochastic resets.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Mechanics
Dominic T. Robson, Andreas C. W. Baas, Alessia Annibale
Summary: The study introduces a mean-field framework for analyzing systems of interacting particles sharing a conserved quantity, which generalizes and unites asset-exchange and aggregation-fragmentation models. By deriving self-consistency equations and a full solution for the time evolution of moments, the model can be applied to various problems and allows for the study of systems with complex interactions.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Debraj Das, Sushanta Dattagupta, Shamik Gupta
Summary: This study presents a general theoretical framework for describing the average behavior of a quantum system under non-unitary evolution and random interruptions. The study finds that, under certain interactions, particles can localize at specific positions and it is possible to suppress the temporal decay of the particle's probability through projection measurements.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Mechanics
Karol Capala, Bartlomiej Dybiec
Summary: The study demonstrates that the combined action of noise and deterministic force can induce resonant effects in dynamical systems, showcasing a minimal, deterministic force-free setup allowing for noise-induced resonance. Depending on the initial direction of modulation, either resonant-activation-like or noise-enhanced-stability-like phenomena can be observed in the problem of escape from finite intervals driven by alpha-stable noise with a periodically modulated stability index. Compared to traditional Levy flights, Levy flights with a time-dependent jump length exponent can either facilitate or slow down the escape from finite intervals in a similar manner to the modulation of potential in the resonant activation setup.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Sara Dal Cengio, Demian Levis, Ignacio Pagonabarraga
Summary: The study examines the breakdown of detailed balance in non-equilibrium systems and its connection to violations of the fluctuation-dissipation theorem. By establishing general constraints on non-equilibrium steady-states, the research provides a unified approach to deriving extended fluctuation-dissipation relations and understanding the departure from equilibrium in active systems and their linear response. By analyzing paradigmatic models of interacting self-propelled particles, the research clarifies the genuinely non-equilibrium features of these systems and derives extended fluctuation-dissipation relations for them.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Caiyun Zhang, Yuhang Hu, Jian Liu
Summary: This paper studies the anomalous diffusion of the correlated continuous-time random walk considering stochastic resetting, and finds that it displays different diffusive behaviors from the uncorrelated case. In the strong correlation scenario, stochastic resetting cannot compete with space-time correlation, leading to diffusion behavior similar to that without resetting, and a steady distribution is never reached.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Mechanics
Harald Schmid, Sauro Succi, Stefano Ruffo
Summary: The equilibration process of the strongly coupled quartic Fermi-Pasta-Ulam-Tsingou model is investigated by adding Langevin baths to the ends of the chain. Numerical simulations show that the energy spectrum thermalization favors small-scale, high-frequency modes and the equilibration time scales linearly with system size while exhibiting power-law decay with nonlinearity and temperature strength. Nonlinear interaction among modes speeds up the thermalization process.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
B. De Bruyne, J. Randon-Furling, S. Redner
Summary: The study introduces a minimalist dynamical model of wealth evolution and sharing to compare altruism and individualism. Results show that altruism leads to more global wealth at early times, but individualists eventually accumulate most wealth and are richer and longer lived than altruists.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Jean-Francois Derivaux, Robert L. Jack, Michael E. Cates
Summary: We studied a mixture of active and passive particles in one dimension with repulsive exclusion interactions under a ratchet potential. The research shows that in certain parameter regimes, the direction of the current is reversed due to the collision between hot passive particles and cold active ones.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Mechanics
A. Imparato
Summary: A 1D model of interacting particles moving on a periodic substrate and in a position dependent temperature profile shows that when the substrate and temperature profile are spatially asymmetric, a centre-of-mass velocity develops which leads to a directed transport of the chain. By tuning the model parameters, particles can transition from an ordered to disordered configuration, with the maximal motor effect achieved in the disordered phase. Collective effects play a crucial role in enhancing the dynamic and thermodynamic performances of microscopic machines.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Karol Capala, Bartlomiej Dybiec
Summary: The study focuses on the escape of randomly accelerated undamped particles from a finite interval under the action of stochastic resetting. Three resetting protocols were compared, showing that partial resetting (restarting velocity or position) and full resetting (restarting both position and velocity) have different effects on facilitating or suppressing escape kinetics. This research also highlighted the fundamental differences between partial resetting scenarios, with position resetting being able to trap the particle in the finite domain of motion under frequent resets.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
E. Gravanis, E. Akylas, G. Livadiotis
Summary: The diffusion of particles with kappa distributed velocities is strongly affected by statistical correlations. The study shows that the superstatistics interpretation is fundamental for understanding kappa distribution, while focusing on a single degree of freedom is inconsistent with this interpretation. The authors also find that the mean energy per degree of freedom is the superstatistical fluctuating temperature in a system with a large number of particles, highlighting the importance of considering correlated degrees of freedom.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Computer Science, Interdisciplinary Applications
Javad Moradi, Somayyeh Belbasi
Summary: This study develops the Larraga and Alvarez-Icaza (LAI) cellular automata model based on safe human reaction to simulate vehicle movement on streets with yielding mechanism and limited speed strategy near intersection points. Results show that the model accurately reproduces realistic acceleration and deceleration capabilities of vehicles. Additionally, the plateau region in total current indicates the difficulty of the yielding mechanism and limited speed strategy, demonstrating their effectiveness in preventing collisions at intersections.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2021)
Article
Optics
Deokhwa Hong, Junghoon Lee, Jongmin Kim, Jong Heum Jung, Kyuhwan Lee, Seji Kang, Y. Shin
Summary: We have observed stationary turbulence in antiferromagnetic spin-1 Bose-Einstein condensates driven by a radio-frequency magnetic field. The injected energy from the magnetic driving causes the emergence of an irregular spin texture in the condensate. Under continuous driving, the condensate evolves into a nonequilibrium steady state with spin turbulence, while the low-energy scale of spin excitations minimally affects the sample's lifetime. When the driving strength is comparable to the system's spin interaction energy and quadratic Zeeman energy, the stationary turbulent state exhibits spin-isotropic features.