Electronic Journal of Probability
- Electron. J. Probab.
- Volume 20 (2015), paper no. 89, 34 pp.
Infinite energy solutions to inelastic homogeneous Boltzmann equations
This paper is concerned with the existence, shape and dynamical stability of infinite-energy equilibria for a class of spatially homogeneous kinetic equations in space dimensions $d\ge2$. Our results cover in particular Bobylev's model for inelastic Maxwell molecules. First, we show under certain conditions on the collision kernel, that there exists an index $\alpha\in(0,2)$ such that the equation possesses a nontrivial stationary solution, which is a scale mixture of radially symmetric $\alpha$-stable laws. We also characterize the mixing distribution as the fixed point of a smoothing transformation. Second, we prove that any transient solution that emerges from the NDA of some (not necessarily radial symmetric) $\alpha$-stable distribution converges to an equilibrium. The key element of the convergence proof is an application of the central limit theorem to a representation of the transient solution as a weighted sum of projections of randomly rotated i.i.d. random vectors.
Electron. J. Probab., Volume 20 (2015), paper no. 89, 34 pp.
Accepted: 8 September 2015
First available in Project Euclid: 4 June 2016
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Bassetti, Federico; Ladelli, Lucia; Matthes, Daniel. Infinite energy solutions to inelastic homogeneous Boltzmann equations. Electron. J. Probab. 20 (2015), paper no. 89, 34 pp. doi:10.1214/EJP.v20-3531. https://projecteuclid.org/euclid.ejp/1465067195