Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 55, Issue 18, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1751-8121/ac5d82
Keywords
active matter; nonequilibrium physics; Stokes-Einstein relation
Categories
Funding
- Thomas Jefferson Fund
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The study investigates the relationship between mobility and diffusivity in an active bath, and finds that the Einstein relation can approximately hold when a mechanically defined different temperature is used.
An active bath, made of self-propelling units, is a nonequilibrium medium in which the Einstein relation D = mu k (B) T between the mobility mu and the diffusivity D of a tracer particle cannot be expected to hold a priori. We consider here heavy tracers for which these coefficients can be related to correlation functions which we estimate. We show that, to a good approximation, an Einstein relation does hold in an active bath upon using a different temperature which is defined mechanically, through the pressure exerted on the tracer.
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