Abstract
We prove in any dimension \({d \geqq 1}\) a local in time existence of weak solutions to the Cauchy problem for the kinetic equation of granular media,
when the initial data are nonnegative, integrable and bounded functions with compact support in velocity, and the interaction potential \({W}\) is a \({C^2({\mathbb{R}}^d)}\) radially symmetric convex function. Our proof is constructive and relies on a splitting argument in position and velocity, where the spatially homogeneous equation is interpreted as the gradient flow of a convex interaction energy with respect to the quadratic Wasserstein distance. Our result generalizes the local existence result obtained by Benedetto et al. (RAIRO Modél Math Anal Numér 31(5):615–641, 1997) on the one-dimensional model of this equation for a cubic power-law interaction potential.
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Communicated by D. Kinderlehrer
M. Agueh is supported by a grant from the Natural Science and Engineering Research Council of Canada (NSERC).
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Agueh, M. Local Existence of Weak Solutions to Kinetic Models of Granular Media. Arch Rational Mech Anal 221, 917–959 (2016). https://doi.org/10.1007/s00205-016-0975-1
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DOI: https://doi.org/10.1007/s00205-016-0975-1