Bounded Solutions of the Boltzmann Equation in the Whole Space

Details Bounded Solutions of the Boltzmann Equation in the Whole Space Bounded Solutions of the Boltzmann Equation in the Whole Space

2010-10-27

arxiv.org/abs/1010.5590v1

Mathematics

Analysis of PDEs

Scientific paper

We construct bounded classical solutions of the Boltzmann equation in the whole space without specifying any limit behaviors at the spatial infinity and without assuming the smallness condition on initial data. More precisely, we show that if the initial data is non-negative and belongs to a uniformly local Sobolev space in the space variable with Maxwellian type decay property in the velocity variable, then the Cauchy problem of the Boltzmann equation possesses a unique non-negative local solution in the same function space, both for the cutoff and non-cutoff collision cross section with mild singularity. The known solutions such as solutions on the torus (space periodic solutions) and in the vacuum (solutions vanishing at the spatial infinity), and solutions in the whole space having a limit equilibrium state at the spatial infinity are included in our category.

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