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Entropy production inequalities for the Kac Walk

1Work partially supported by U.S. National Science Foundation grant DMS 1501007. 2Work partially supported by supported by Fundação para a Ciência e Tecnologia (PTDC/MAT/100983/2008, PEst-OE/MAT/UI0209/2013, UID/MAT/04561/2013). 3Work supported by EPSRC grant EP/L002302/1

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  • Mark Kac introduced what is now called 'the Kac Walk' with the aim of investigating the spatially homogeneous Boltzmann equation by probabilistic means. Much recent work, discussed below, on Kac's program has run in the other direction: using recent results on the Boltzmann equation, or its one-dimensional analog, the non-linear Kac-Boltzmann equation, to prove results for the Kac Walk. Here we investigate new functional inequalities for the Kac Walk pertaining to entropy production, and introduce a new form of 'chaoticity'. We then show how these entropy production inequalities imply entropy production inequalities for the Kac-Boltzmann equation. This results validate Kac's program for proving results on the non-linear Boltzmann equation via analysis of the Kac Walk, and they constitute a partial solution to the 'Almost' Cercignani Conjecture on the sphere.

    Mathematics Subject Classification: Primary: 81V99, 82B10, 94A17.

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