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F. Bassitti, L. Ladelli, D. Matthes:
"Central limit theorem for a class of one-dimensional equations";
in: "ASC Report37/2008", issued by: Institute for Analysis and Scientific Computing; Vienna University of Technology, Wien, 2008, ISBN: 978-3-902627-01-8.

We introduce a class of Boltzmann equations on the real line, which constitute extensions of the classical Kac caricature. The collisional gain operators are defined by smoothing transformations with quite general properties. By establishing a connection to the central limit problem, we are able to prove long-time convergence of the equation's solutions towards a limit distribution. If the initial condition for the Boltzmann equation belongs to the domain of normal attraction of a certain stable law $\nu_\alpha$, then the limit is a scale mixture of $\nu_\alpha$. Under some additional assumptions, explicit exponential rates for the convergence to equilibrium in Wasserstein metrics are calculated, and strong convergence of the probability densities is shown.

http://www.asc.tuwien.ac.at/preprint/2008/asc37x2008.pdf