Non-reciprocal hidden degrees of freedom: A unifying perspective on memory, feedback, and activity
arXiv:1910.08372
Abstract
We show that memory, feedback, and activity are all describable by the same unifying concept, that is non-reciprocal (NR) coupling. We demonstrate that characteristic thermodynamic features of these intrinsically nonequilibrium systems are reproduced by low-dimensional Markovian networks with NR coupling, which we establish as minimal models for such complex systems. NR coupling alone implies a violation of the fluctuation-dissipation relation, which is inevitably connected to entropy production, i.e., irreversibility. Hiding the NR coupled degrees of freedom renders non-Markovian, one-variable Langevin descriptions with complex types of memory, for which we find a generalized second law involving information flow. We demonstrate that non-monotonic memory is inextricably linked to NR coupling. Furthermore, we discuss discrete time delay as the infinite-dimensional limit, and find a divergent entropy production, corresponding to unbounded cost for precisely storing a Brownian trajectory.
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