Dark matter phase space densities

Details Dark matter phase space densities Dark matter phase space densities

2000-06-06

arxiv.org/abs/astro-ph/0006074v2

Phys.Rev. D64 (2001) 027301

Astronomy and Astrophysics

Astrophysics

Refs. updated, footnote added to match version to appear in Physical Review D (15 July 2001)

Scientific paper

10.1103/PhysRevD.64.027301

The low velocity part of a kinetic equilibrium dark matter distribution has higher phase space density and is more easily incorporated in formation of a low mass galaxy than the high velocity part. For relativistically decoupling fermions (bosons), this explains one (two) orders of magnitude of the observed trend, that phase space densities in dark matter halo cores are highest in the smallest systems, and loosens constraints on particle masses significantly. For non-relativistic decoupling and/or finite chemical potentials even larger effects may occur. It is therefore premature to dismiss dissipationless particle distributions as dark matter on the basis of phase space arguments.

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