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Origins and diagnostics of the nonequilibrium character of active systems

By Lokrshi Prawar Dadhichi, Ananyo Maitra and Sriram Ramaswamy


We present in detail a Langevin formalism for constructing stochastic dynamical equations for active-matter systems coupled to a thermal bath. We apply the formalism to clarify issues of principle regarding the sources and signatures of nonequilibrium behaviour in a variety of polar and apolar single-particle systems and polar flocks. We show that distance from thermal equilibrium depends on how time-reversal is implemented and hence on the reference equilibrium state. We predict characteristic forms for the frequency-resolved entropy production for an active polar particle in a harmonic potential, which should be testable in experiments

Topics: Condensed Matter - Soft Condensed Matter, Condensed Matter - Other Condensed Matter, Condensed Matter - Statistical Mechanics
Publisher: 'IOP Publishing'
Year: 2018
DOI identifier: 10.1088/1742-5468/aae852
OAI identifier:

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