TITLE:
Warm Dark Matter and the Formation of First Galaxies
AUTHORS:
Bruce Hoeneisen
KEYWORDS:
Warm Dark Matter, First Galaxies, First Stars, Population III Stars, Reioniza-tion
JOURNAL NAME:
Journal of Modern Physics,
Vol.13 No.6,
June
28,
2022
ABSTRACT: By numerical integration of hydro-dynamical equations, we study the formation of elliptical and spiral galaxies starting from primordial linear density-velocity-gravitational perturbations. Both dark matter and baryons are included. Warm dark matter perturbations acquire two low mass cut-offs: the free-streaming cut-off due to the power spectrum free-streaming cut-off factor τ2(k), and the velocity dispersion cut-off. The Press-Schechter mass distribution does not include velocity dispersion, and should not be used below the velocity dispersion cut-off mass. From the formation of first galaxies and reionization, we estimate limits on the non-relativistic warm dark matter velocity dispersion at expansion parameter , with .