Cedric Villani recently wrote an article on Landau damping in collisionless plasmas, where at least one topic discussed confused me. Besides discussing the issue of how a process can be microscopically reversible and macroscopically irreversible, he mentions something regarding a "entropy-preserving relaxation mechanism" that is irreversible.
Am I missing something? I think the article is suggesting that something can preserve entropy but still be irreversible.
This begs the following questions:
- Are entropy and irreversibility synonymous?
- Or are they distinct entities each with their own fundamental properties?
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