Service de Physique de l'Etat Condensé

On the bifurcations of Vlasov equation
Julien Barré - Université d'Orléans, Laboratoire MAPMO
Mercredi 16/01/2019, 11:15-12:15
SPEC Salle Itzykson, Bât.774, Orme des Merisiers

Vlasov equation appears in a variety of physical situations, the most well-known being plasma physics, where electrons and ions interact through electro-magnetic forces, and self-gravitating systems, where stars – for instance- interact through gravitation.
My goal here is to study the qualitative dynamical behaviors of Vlasov equation, with an emphasis on universal ones, that is those which do not depend on the underlying physical system. In particular, I will be interested in the bifurcations of the stationary states: what happens when a stationary state is destabilized as a parameter is varied?
I will first introduce the Vlasov equation, its structure and its dynamical peculiarities (stationary states, Landau damping, for instance), and then turn to the description of certain generic bifiurcation, and attempt a classification. I will also suggest some possible applications.

This is based on joint works with David Métivier (Los Alamos National Laboratory) and Yoshiyuki Yamaguchi (Kyoto University).

A coffee break will be served at 11h00.

Contact : Cesare NARDINI

 

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