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- W3044792595 abstract "We consider the relaxation of a driven granular gas, as the prototypical example of an intrinsically non-equilibrium system, between two non-equilibrium steady states. For time-independent driving, the natural time scale for relaxation is characterised from an empirical---the relaxation function---and a fundamental---the recently introduced classical speed limits---point of view. Making use of control theory, we show how optimal bang-bang processes beat both the empirical and fundamental relaxation times. These bang-bang processes comprise two steps: heating with the largest possible value of the driving and free cooling, i.e. zero driving. The order of the bangs depends on the temperature of the final non-equilibrium steady state being larger or smaller than the initial one. These optimal protocols are implemented in numerical simulations of the dynamics of the granular gas, which show an excellent agreement with our theoretical predictions." @default.
- W3044792595 created "2020-07-29" @default.
- W3044792595 creator A5025478785 @default.
- W3044792595 date "2020-07-23" @default.
- W3044792595 modified "2023-09-27" @default.
- W3044792595 title "Beating the natural time scale for relaxation with optimal control" @default.
- W3044792595 hasPublicationYear "2020" @default.
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