Boltzmann Equation and the H-Theorem

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Typicality Reasoning in Probability, Physics, and Metaphysics

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Abstract

Although the formula engraved on Boltzmann’s tombstone is Eq. (8.1), connecting the entropy of a system with the measure associated with its macrostate, his name is at least as intimately associated with the Boltzmann equation and the H-theorem, describing, in a more quantitative manner, convergence to equilibrium for a low-density gas. This H-theorem is of great interest in light of our previous discussion, because it can be seen as a concrete implementation of the general scheme that we introduced as the “typicality account.”

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Notes

  1. 1.

    For a good introduction to these topics, see also Davies (1977); for more detailed mathematical treatments, e.g., Spohn (1991), Villani (2002).

  2. 2.

    An equation of this type was introduced by A.A. Vlasov (1938, 1968) in his work on plasma physics and even earlier by J.H. Jeans (1915) in the context of Newtonian stellar dynamics.

  3. 3.

    There is no issue here as to whether we let the clock run “forward” or “backward”—the problem is symmetric with respect to the time evolution in both directions.

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Lazarovici, D. (2023). Boltzmann Equation and the H-Theorem. In: Typicality Reasoning in Probability, Physics, and Metaphysics. New Directions in the Philosophy of Science. Palgrave Macmillan, Cham. https://doi.org/10.1007/978-3-031-33448-1_10

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