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SUMMARY:Oscillations vs. relaxation in galactic dynamics (Cancelled) - Mah
 ir Hadžić (University College London)
DTSTART:20221017T130000Z
DTEND:20221017T140000Z
UID:TALK180290@talks.cam.ac.uk
CONTACT:Daniel Boutros
DESCRIPTION:We give an overview of recent developments in the stability st
 udy of nontrivial equilibria in Newtonian (Vlasov-Poisson) and relativisti
 c (Einstein-Vlasov) galactic dynamics. In the Newtonian setting we discuss
  the existence of linear oscillating modes and the validity of the gravita
 tional Landau damping in this context. In the relativistic setting we show
  that the classical Antonov linear stability criterion is not true: steady
  galaxies with very dense cores lead to existence of growing modes. Our re
 sults highlight the importance of the Hamiltonian structure of these syste
 ms. The talk is based on published and ongoing works with Z. Lin\, G. Rein
 \, M. Schrecker\, and C. Straub. \n
LOCATION:CMS\, MR13
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