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Title: Linear response theory and Green-Kubo relations for active matter
Author: Cengio, Sara dal
Levis, Demian
Pagonabarraga Mora, Ignacio
Keywords: Matèria
Física estadística
Statistical physics
Issue Date: 6-Jul-2019
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2019, vol. 123, num. 23, p. 238003
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))

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