The “Past Hypothesis”: Not even false

Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 37 (3):399-430 (2006)
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Abstract

It has become something of a dogma in the philosophy of science that modern cosmology has completed Boltzmann's program for explaining the statistical validity of the Second Law of thermodynamics by providing the low entropy initial state needed to ground the asymmetry in entropic behavior that underwrites our inference about the past. This dogma is challenged on several grounds. In particular, it is argued that it is likely that the Boltzmann entropy of the initial state of the universe is an ill-defined or severely hobbled concept. It is also argued that even if the entropy of the initial state of the universe had a well-defined, low value, this would not suffice to explain why thermodynamics works as well as it does for the kinds of systems we care about. Because the role of Boltzmann entropy in our inferences to the past has been vastly overrated, the failure of the Boltzmann program does not pose a serious problem for our knowledge of the past. But it does call a different explanation of why thermodynamics works as well as it does. A suggestion is offered for a different approach.

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Citations of this work

Quantum Mechanics in a Time-Asymmetric Universe: On the Nature of the Initial Quantum State.Eddy Keming Chen - 2021 - British Journal for the Philosophy of Science 72 (4):1155–1183.
Fundamental Nomic Vagueness.Eddy Keming Chen - 2022 - Philosophical Review 131 (1):1-49.
The Past Hypothesis and the Nature of Physical Laws.Eddy Keming Chen - 2023 - In Barry Loewer, Brad Weslake & Eric B. Winsberg (eds.), The Probability Map of the Universe: Essays on David Albert’s _Time and Chance_. Cambridge MA: Harvard University Press. pp. 204-248.
Philosophy of Cosmology.Chris Smeenk - 2013 - In Robert W. Batterman (ed.), The Oxford Handbook of Philosophy of Physics. Oxford University Press USA. pp. 607-652.

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