Abstract
The H-theorem is an extension of the Second Law to a time-sequence of states that need not be equilibrium ones. In this paper we review and we rigourously establish the connection with macroscopic autonomy.
If for a Hamiltonian dynamics for many particles, the macrostate evolves autonomously, then its entropy is non-decreasing as a consequence of Liouville's theorem. That observation, made since long, is here rigorously analyzed with special care to reconcile the application of Liouville's theorem (for a finite number of particles) with the condition of autonomous macroscopic evolution (sharp only in the limit of infinite scale separation); and to evaluate the presumed necessity of a semigroup property for the macroscopic evolution.
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Roeck, W.D., Maes, C. & Netočný, K. H-Theorems from Macroscopic Autonomous Equations. J Stat Phys 123, 571–584 (2006). https://doi.org/10.1007/s10955-006-9079-x
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DOI: https://doi.org/10.1007/s10955-006-9079-x