Abstract
We quantify the long-time behavior of a system of (partially) inelastic particles in a stochastic thermostat by means of the contractivity of a suitable metric in the set of probability measures. Existence, uniqueness, boundedness of moments and regularity of a steady state are derived from this basic property. The solutions of the kinetic model are proved to converge exponentially as t → ∞ to this diffusive equilibrium in this distance metrizing the weak convergence of measures. Then, we prove a uniform bound in time on Sobolev norms of the solution, provided the initial datum has a finite norm in the corresponding Sobolev space. These results are then combined, using interpolation inequalities, to obtain exponential convergence to the diffusive equilibrium in the strong L1-norm, as well as various Sobolev norms.
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Bisi, M., Carrillo, J.A. & Toscani, G. Contractive Metrics for a Boltzmann Equation for Granular Gases: Diffusive Equilibria. J Stat Phys 118, 301–331 (2005). https://doi.org/10.1007/s10955-004-8785-5
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DOI: https://doi.org/10.1007/s10955-004-8785-5