2026-04-17T00:45:55Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1579602025-12-04T20:47:58Zcom_2072_1057col_2072_478822col_2072_478914col_2072_478917

00925njm 22002777a 4500 dc Cengio, Sara dal author Levis, Demian author Pagonabarraga Mora, Ignacio author 2020-04-29T05:57:37Z 2020-04-29T05:57:37Z 2019-07-06 2020-04-29T05:57:37Z We address the question of how interacting active systems in a nonequilibrium steady state respond to an external perturbation. We establish an extended fluctuation-dissipation theorem for active Brownian particles (ABP), which highlights the role played by the local violation of detailed balance due to activity. By making use of a Markovian approximation we derive closed Green-Kubo expressions for the diffusivity and mobility of ABP and quantify the deviations from the Stokes-Einstein relation. We compute the linear response function to an external force using unperturbed simulations of ABP and compare the results with the analytical predictions of the transport coefficients. Our results show the importance of the interplay between activity and interactions in the departure from equilibrium linear response. Matèria Física estadística Matter Statistical physics Linear response theory and Green-Kubo relations for active matter