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The Nature of the Past Hypothesis

There's a narrative about the nature of asymmetry in time which can be caricatured like this. Firstly, there is our fundamental physics if we're being really careful about it, this is the standard model or our preferred post-standard-model physics; in reality, in the practical cases we think about, it’s more likely to be ordinary quantum mechanics or maybe even classical Hamiltonian dynamics. In any case, it’s supposed to be the physics of the micro-constituents of the world. And it is time-reversal invariant and shows no particular direction of time.