Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid - Sorbonne Université
Journal Articles Physical Review E Year : 2019

Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid

Abstract

Simplest extensions of single particle dynamics in a momentum conserving active fluid-an active suspension of two colloidal particles or a single particle confined by a wall-exhibit strong departures from Boltzmann behavior, resulting in either a breakdown of an effective temperature description or a steady state with nonzero entropy production rate. This is a consequence of hydrodynamic interactions that introduce multiplicative noise in the stochastic description of particle positions. This results in fluctuation-induced interactions that depend on distance as a power law. We find that the dynamics of activated colloids in a passive fluid, with stochastic forcing localized on the particle, is different from that of passive colloids in an active fluctuating fluid.
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Dates and versions

hal-02882447 , version 1 (26-06-2020)

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Amit Singh Vishen, Jacques Prost, Madan Rao. Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid. Physical Review E , 2019, 100 (6), ⟨10.1103/PhysRevE.100.062602⟩. ⟨hal-02882447⟩
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