Warm dark matter from theory and galaxy observations
Hector J. de VEGA
(LPTHE, CNRS \& UPMC
Résumé :
Several relevant observed properties of galaxies depend on the mass
of the dark matter particles. We contrast the observed phase-space
density of galaxies and the observed surface density of galaxies
to the theoretically computed values. These are obtained by solving
the evolution of the primordial cosmological density fluctuations
since the early universe till today.
Dark matter (DM) turns to be Warm: the DM particle mass turns to be
between 1 and 2 keV and its decoupling temperature turns
to be 100 GeV or more. These results are independent of the particle
physics model for the dark matter.
The theoretical density profiles of galaxies obtained from the
primordial cosmological fluctuations turn to be cored for warm dark matter
(keV scale DM particle masses) and cusped for cold dark matter
(heavy DM, mass > 1 GeV). Particle physics candidates for Warm DM
as the sterile neutrino will be discussed.
