Contractive metrics for a boltzmann equation for granular gases: Diffusive equilibria

Jose Antonio Carrillo De La Plata, M. Bisi, G. Toscani

Research output: Contribution to journalArticleResearchpeer-review

37 Citations (Scopus)


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 L 1 -norm, as well as various Sobolev norms. © 2005.
Original languageEnglish
Pages (from-to)301-331
JournalJournal of Statistical Physics
Issue number1-2
Publication statusPublished - 1 Jan 2005


  • Boltzmann equation
  • Contractivity
  • Inelastic interactions
  • Stochastic heating

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