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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)
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))
Publicacions de projectes de recerca finançats per la UE

Citació

DAL CENGIO, Sara, LEVIS, Demian and 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, num. 043201. ISSN 1742-5468. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/184759

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