Baths produce friction and random forcing on particles suspended in them. The relation between noise and friction in (generalized) Langevin equations is usually referred to as the second fluctuation–dissipation theorem. We show what is the proper nonequilibrium extension, to be applied when the environment is itself active and driven. In particular we determine the effective Langevin dynamics of a probe from integrating out a steady nonequilibrium environment. The friction kernel picks up a frenetic contribution, i.e., involving the environment’s dynamical activity, responsible for the breaking of the standard Einstein relation.
On the Second Fluctuation–Dissipation Theorem for Nonequilibrium Baths
Published 2013 in Journal of Statistical Physics
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- Publication year
2013
- Venue
Journal of Statistical Physics
- Publication date
2013-09-12
- Fields of study
Physics
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