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2021-01-07

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/184759

Fluctuation-Dissipation Relations in the absence of Detailed Balance: formalism and applications to Active Matter

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Recurs relacionat

https://doi.org/10.1088/1742-5468/abee22

Resum

We present a comprehensive study about the relationship between the way Detailed Balance is broken in non-equilibrium systems and the resulting violations of the Fluctuation-Dissipation Theorem. Starting from stochastic dynamics with both odd and even variables under Time-Reversal, we exploit the relation between entropy production and the breakdown of Detailed Balance to establish general constraints on the non-equilibrium steady-states (NESS), which relate the non-equilibrium character of the dynamics with symmetry properties of the NESS distribution. This provides a direct route to derive extended Fluctuation-Dissipation Relations, expressing the linear response function in terms of NESS correlations. Such framework provides a unified way to understand the departure from equilibrium of active systems and its linear response. We then consider two paradigmatic models of interacting self-propelled particles, namely Active Brownian Particles (ABP) and Active Ornstein-Uhlenbeck Particles (AOUP). We analyze the non-equilibrium character of these systems (also within a Markov and a Chapman-Enskog approximation) and derive extended Fluctuation-Dissipation Relations for them, clarifying which features of these active model systems are genuinely non-equilibrium.

Matèries

Fluctuacions (Física), Matèria condensada tova, Mecànica estadística

Matèries (anglès)

Fluctuations (Physics), Soft condensed matter, Statistical mechanics

Citació

Col·leccions

Articles publicats en revistes (Física de la Matèria Condensada)
<b>Publicacions de projectes de recerca finançats per la UE</b>
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))

Citació

DAL CENGIO, Sara, LEVIS, Demian, PAGONABARRAGA MORA, Ignacio. Fluctuation-Dissipation Relations in the absence of Detailed Balance: formalism and applications to Active Matter. _Journal of Statistical Mechanics: Theory and Experiment_. 2021. Vol. 4, núm. 043201. [consulta: 25 de febrer de 2026]. ISSN: 1742-5468. [Disponible a: https://hdl.handle.net/2445/184759]

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