# Time asymmetry of the Kramers equation with nonlinear friction: fluctuation-dissipation relation and ratchet effect.

@article{Sarracino2013TimeAO, title={Time asymmetry of the Kramers equation with nonlinear friction: fluctuation-dissipation relation and ratchet effect.}, author={Alessandro Sarracino}, journal={Physical review. E, Statistical, nonlinear, and soft matter physics}, year={2013}, volume={88 5}, pages={ 052124 } }

We show by numerical simulations that the presence of nonlinear velocity-dependent friction forces can induce a finite net drift in the stochastic motion of a particle in contact with an equilibrium thermal bath and in an asymmetric periodic spatial potential. In particular, we study the Kramers equation for a particle subjected to Coulomb friction, namely a constant force acting in the direction opposite to the particle's velocity. We characterize the nonequilibrium irreversible dynamics by…

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