On the uniqueness for the spatially homogeneous Boltzmann equation with a strong angular singularity. (English) Zbl 1144.82060
Summary: We prove an inequality on the Wasserstein distance with quadratic cost between two solutions of the spatially homogeneous Boltzmann equation without angular cutoff, from which we deduce some uniqueness results. In particular, we obtain a local (in time) well-posedness result in the case of (possibly very) soft potentials. A global well-posedness result is shown for all regularized hard and soft potentials without angular cutoff. Our uniqueness result seems to be the first one applying to a strong angular singularity, except in the special case of Maxwell molecules.
Our proof relies on the ideas of H. Tanaka [Z. Wahrscheinlichkeitstheor. Verw. Geb. 46, 67–105 (1978; Zbl 0389.60079)]. We give a probabilistic interpretation of the Boltzmann equation in terms of a stochastic process. Then we show how to couple two such processes started with two different initial conditions, in such a way that they almost surely remain close to each other.
Our proof relies on the ideas of H. Tanaka [Z. Wahrscheinlichkeitstheor. Verw. Geb. 46, 67–105 (1978; Zbl 0389.60079)]. We give a probabilistic interpretation of the Boltzmann equation in terms of a stochastic process. Then we show how to couple two such processes started with two different initial conditions, in such a way that they almost surely remain close to each other.
MSC:
| 82C40 | Kinetic theory of gases in time-dependent statistical mechanics |
| 76P05 | Rarefied gas flows, Boltzmann equation in fluid mechanics |
| 82C22 | Interacting particle systems in time-dependent statistical mechanics |
Keywords:
Boltzmann equation without cutoff; long-range interaction; uniqueness; Wasserstein distance; quadratic costCitations:
Zbl 0389.60079References:
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