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Violation of Local Detailed Balance Despite a Clear Time-Scale Separation

MPS-Authors

Hartich,  D
Research Group of Mathematical Biophysics, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society;

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Godec,  A.
Research Group of Mathematical Biophysics, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society;

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Citation

Hartich, D., & Godec, A. (2021). Violation of Local Detailed Balance Despite a Clear Time-Scale Separation. arXiv. doi:10.48550/arXiv.2111.14734.


Cite as: https://hdl.handle.net/21.11116/0000-000B-31C4-0
Abstract
Integrating out fast degrees of freedom is known to yield, to a good approximation, memory-less,
i.e. Markovian, dynamics. In the presence of such a time-scale separation local detailed balance is
believed to emerge and to guarantee thermodynamic consistency arbitrarily far from equilibrium.
Here we present a transparent example of a Markov model of a molecular motor where local detailed
balance can be violated despite a clear time-scale separation and hence Markovian dynamics. Driving
the system far from equilibrium can lead to a violation of local detailed balance against the driving
force. We further show that local detailed balance can be restored, even in the presence of memory,
if the coarse-graining is carried out as Milestoning. Our work establishes Milestoning not only as
a kinetically but for the first time also as a thermodynamically consistent coarse-graining method.
Our results are relevant as soon as individual transition paths are appreciable or can be resolved.