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Probabilistic Study of the Speed of Approach to Equilibrium for an Inelastic Kac Model

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Abstract

This paper deals with a one-dimensional model for granular materials, which boils down to an inelastic version of the Kac kinetic equation, with inelasticity parameter p>0. In particular, the paper provides bounds for certain distances—such as specific weighted χ-distances and the Kolmogorov distance—between the solution of that equation and the limit. It is assumed that the even part of the initial datum (which determines the asymptotic properties of the solution) belongs to the domain of normal attraction of a symmetric stable distribution with characteristic exponent α=2/(1+p). With such initial data, it turns out that the limit exists and is just the aforementioned stable distribution. A necessary condition for the relaxation to equilibrium is also proved. Some bounds are obtained without introducing any extra condition. Sharper bounds, of an exponential type, are exhibited in the presence of additional assumptions concerning either the behaviour, close to the origin, of the initial characteristic function, or the behaviour, at infinity, of the initial probability distribution function.

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Authors and Affiliations

  1. Dipartimento di Matematica, Università degli Studi di Pavia, via Ferrata 1, 27100, Pavia, Italy

    Federico Bassetti & Eugenio Regazzini

  2. Dipartimento di Matematica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133, Milan, Italy

    Lucia Ladelli

Authors
  1. Federico Bassetti
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  2. Lucia Ladelli
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  3. Eugenio Regazzini
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Corresponding author

Correspondence to Eugenio Regazzini.

Additional information

Research partially supported by Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR grant 2006/134526).

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Bassetti, F., Ladelli, L. & Regazzini, E. Probabilistic Study of the Speed of Approach to Equilibrium for an Inelastic Kac Model. J Stat Phys 133, 683–710 (2008). https://doi.org/10.1007/s10955-008-9630-z

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  • DOI: https://doi.org/10.1007/s10955-008-9630-z

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