Abstract
Kinetic transport equations with a given confining potential and non-linear relaxation type collision operators are considered. General (monotone) energy dependent equilibrium distributions are allowed with a chemical potential ensuring mass conservation. Existence and uniqueness of solutions is proved for initial data bounded by equilibrium distributions. The diffusive macroscopic limit is carried out using compensated compactness theory. The results are drift-diffusion equations with non linear diffusion. The most notable examples are of the form \(\partial_t \rho=\nabla\cdot (\nabla \rho^m + \rho\,\nabla V)\) , ranging from porous medium equations to fast diffusion, with the exponent satisfying \(0 < m < 5/3\) in \({\mathbb{R}}^3\) .
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Communicated by Y. Brenier.
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Dolbeault, J., Markowich, P., Oelz, D. et al. Non linear Diffusions as Limit of Kinetic Equations with Relaxation Collision Kernels. Arch Rational Mech Anal 186, 133–158 (2007). https://doi.org/10.1007/s00205-007-0049-5
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DOI: https://doi.org/10.1007/s00205-007-0049-5