2026-04-14T07:57:38Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1847592025-11-19T20:27:25Zcom_2072_1057col_2072_478822col_2072_478914col_2072_478917

Fluctuation-Dissipation Relations in the absence of Detailed Balance: formalism and applications to Active Matter Dal Cengio, Sara Levis, Demian Pagonabarraga Mora, Ignacio Fluctuacions (Física) Matèria condensada tova Mecànica estadística Fluctuations (Physics) Soft condensed matter Statistical mechanics 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. 2022-04-05T17:34:41Z 2022-04-05T17:34:41Z 2021-01-07 2022-04-05T17:34:41Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 1742-5468 https://hdl.handle.net/2445/184759 719751 eng Versió postprint del document publicat a: https://doi.org/10.1088/1742-5468/abee22 Journal of Statistical Mechanics: Theory and Experiment, 2021, vol. 4, p. 043201 https://doi.org/10.1088/1742-5468/abee22 info:eu-repo/grantAgreement/EC/H2020/674979/EU//NANOTRANS (c) IOP Publishing Ltd and SISSA Medialab srl, 2021 info:eu-repo/semantics/openAccess application/pdf application/pdf International School for Advanced Studies (SISSA) and IOP Publishing (IOP) Articles publicats en revistes (Física de la Matèria Condensada)