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Dissipation controls transport and phase transitions in active fluids: mobility, diffusion and biased ensembles

Published version
Peer-reviewed

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Type

Article

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Authors

Nemoto, Takahiro 
Vaikuntanathan, Suriyanarayanan 

Abstract

jats:titleAbstract</jats:title> jats:pActive fluids operate by constantly dissipating energy at the particle level to perform a directed motion, yielding dynamics and phases without any equilibrium equivalent. The emerging behaviors have been studied extensively, yet deciphering how local energy fluxes control the collective phenomena is still largely an open challenge. We provide generic relations between the activity-induced dissipation and the transport properties of an internal tracer. By exploiting a mapping between active fluctuations and disordered driving, our results reveal how the local dissipation, at the basis of self-propulsion, constrains internal transport by reducing the mobility and the diffusion of particles. Then, we employ techniques of large deviations to investigate how interactions are affected when varying dissipation. This leads us to shed light on a microscopic mechanism to promote clustering at low dissipation, and we also show the existence of collective motion at high dissipation. Overall, these results illustrate how tuning dissipation provides an alternative route to phase transitions in active fluids.</jats:p>

Description

Keywords

51 Physical Sciences, 5103 Classical Physics, 7 Affordable and Clean Energy

Journal Title

New Journal of Physics

Conference Name

Journal ISSN

1367-2630
1367-2630

Volume Title

Publisher

IOP Publishing
Sponsorship
National Science Foundation (DMR-1848306)
Agence Nationale de la Recherche (ANR-10-EQPX-29-01)