In Andreas Hüttemann & Gerhard Ernst (eds.), Time, Chance and Reduction. Cambridge, UK: Cambridge University Press. pp. 34-58 (2010)

Abstract
The Past Hypothesis is the claim that the Boltzmann entropy of the universe was extremely low when the universe began. Can we make sense of this claim when *classical* gravitation is included in the system? I first show that the standard rationale for not worrying about gravity is too quick. If the paper does nothing else, my hope is that it gets the problems induced by gravity the attention they deserve in the foundations of physics. I then try to make plausible a very weak claim: that there is a well-defined Boltzmann entropy that *can* increase in *some* interesting self-gravitating systems. More work is needed before we can say whether this claim answers the threat to the standard explanation of entropy increase.
Keywords Entropy  Gravity  Statistical mechanics
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Reprint years 2010
DOI 10.1017/cbo9780511770777.003.
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Two Accounts of Laws and Time.Barry Loewer - 2012 - Philosophical Studies 160 (1):115-137.
Calling for explanation: the case of the thermodynamic past state.Dan Baras & Orly Shenker - 2020 - European Journal for Philosophy of Science 10 (3):1-20.
Thermodynamic Asymmetry in Time.Craig Callender - 2008 - Stanford Encyclopedia of Philosophy.
The Implementation, Interpretation, and Justification of Likelihoods in Cosmology.C. D. McCoy - 2018 - Studies in History and Philosophy of Modern Physics 62:19-35.

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