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SUMMARY:Relaxation without dissipation for plasmas and galactic dynamics -
  Clement Mouhot (ENS Paris)
DTSTART:20091109T160000Z
DTEND:20091109T170000Z
UID:TALK20925@talks.cam.ac.uk
CONTACT:Prof. Mihalis Dafermos
DESCRIPTION:In this talk I shall give an introduction to recent work in co
 llaboration with Cedric Villani. Landau damping was discovered by Landau i
 n 1946 and is still one of the major mysteries in classical plasma physics
 . It roughly says that waves are damped in a collisionless plasma\, due to
  purely hamiltonian effects. It seems also to be playing a key role in the
  surprisingly short-time scale of relaxation phenomena in galactic dynamic
 s. We present a non-linear mathematical theory for this damping. Surprisin
 g features of this theory include links with KAM theory\, a strong relatio
 n with the so-called "plasma echoes" phenomenon\, and a critical role play
 ed by analytic regularity.
LOCATION:CMS\, MR15
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