2026-04-14T02:53:41Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Dal Cengio, Sara author Levis, Demian author Pagonabarraga Mora, Ignacio author 2022-04-05T17:34:41Z 2022-04-05T17:34:41Z 2021-01-07 2022-04-05T17:34:41Z 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. Fluctuacions (Física) Matèria condensada tova Mecànica estadística Fluctuations (Physics) Soft condensed matter Statistical mechanics Fluctuation-Dissipation Relations in the absence of Detailed Balance: formalism and applications to Active Matter