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Physics
Quantum Physics
Quantum analog of Boltzmann entropy?
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[QUOTE="vanhees71, post: 6865821, member: 260864"] Of course, the conceptional difficulties of classical statistical mechanics are greater than in quantum statistical physics. Any only-classical theory of matter is conceptionally difficult, and I don't see the merit of developing an ab-initio classical statistical mechanics, when it can be derived much better from the appropriate approximations of quantum statistical mechanics, and there what's most natural indeed is the Shannon-Jaynes-von Neumann entropy as the starting point. Their argument that for a closed system entropy is constant due to unitary time evolution in QT is also not convincing, because the same holds for Boltzmann entropy, when looking at a closed system due to Liouville's theorem, according to which phase-space volume is conserved. [/QUOTE]
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Quantum Physics
Quantum analog of Boltzmann entropy?
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