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wasoxygen · 1455 days ago · link · · parent · post: Physicists Debate Hawking’s Idea That the Universe Had No Beginning
Can't find the earlier comment, but there was an idea that even if it's possible to move back and forth in time, or stay in one place, we can only ever be aware of moving in the direction of increasing entropy, and we call that direction "forward." To be aware of the passage of time, you need to form memories. Forming memories requires work, in the thermodynamic sense. Work that creates memories increases entropy, so memories will only exist at a time with more universal entropy than existed when the remembered events occurred. Something like that, maybe you can sprinkle some math in.