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arXiv · 1710.01098

Regularization estimates and Cauchy theory for inhomogeneous Boltzmann equation for hard potentials without cut-off

Frédéric Hérau·Daniela Tonon·Isabelle Tristani
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Abstract

In this paper, we investigate the problems of Cauchy theory and exponential stability for the inhomogeneous Boltzmann equation without angular cut-off. We only deal with the physical case of hard potentials type interactions (with a moderate angular singularity). We prove a result of existence and uniqueness of solutions in a close-to-equilibrium regime for this equation in weighted Sobolev spaces with a polynomial weight, contrary to previous works on the subject, all developed with a weight prescribed by the equilibrium. It is the first result in this more physically relevant frameworkfor this equation. Moreover, we prove an exponential stability for such a solution, with a rate as close as we want to the optimal rate given by the semigroup decay of the linearized equation. Let us highlight the fact that a key point of the development of our Cauchy theory is the proof of new regularization estimates in short time for the linearized operator thanks to pseudo-differential tools.

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Frédéric Hérau, Daniela Tonon, Isabelle Tristani. 2017-10-03. Regularization estimates and Cauchy theory for inhomogeneous Boltzmann equation for hard potentials without cut-off. https://doi.org/10.1007/s00220-020-03682-8

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