ABSTRACT. We consider dynamical fluctuations of the hard sphere gas at low density (Boltzmann-Grad limit), with random initial data distributed according to the Gibbs equilibrium measure. This is one of the few cases in which the small time restriction intrinsic to the dynamical perturbation theory can be lifted. We shall explain the main features of the proof, which is based on an $L^2$ (entropy-type) bound, together with a suitable coupling of deterministic and stochastic dynamics.
Il seminario avrà luogo in presenza presso il Dipartimento di Matematica e Fisica, L.go S. L. Murialdo 1 - Aula 009
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