Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid
Abstract
Simplest extensions of single particle dynamics in momentum conserving active fluid - that of 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 the 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.
Keywords
Cite
@article{arxiv.1808.03091,
title = {Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid},
author = {Amit Singh Vishen and Jacques Prost and Madan Rao},
journal= {arXiv preprint arXiv:1808.03091},
year = {2019}
}