The classical version of that law includes a definition of a system and entropy increasing over time.(adsbygoogle = window.adsbygoogle || []).push({});

It uses a notion of simultaneousity - we compare a state of the whole system in different moments of time.

My questions:

1. Do you know any good SR-compatible generalizations of that law?

2. Are there any GR-compatible generalizations of that law which can deal with:

* systems is curved spacetime, where the direction arrow of time becomes more and more fuzzy.

* situations where no common (for the whole system) direction of time can be defined; for example, part of a system is orbiting a black hole while another part of it is falling inside;

* systems in closed timelike loops

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# Relativistic version of 2nd law of thermodynamics

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