Dark matter phase space densities

Abstract

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.

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

References in corpus (4)

• Observational evidence for self-interacting cold dark matter
• New Dark Matter Physics: Clues from Halo Structure
• Self-interacting Warm Dark Matter
• Is a Simple Collisionless Relic Dark Matter Particle Ruled Out?

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• Two-fluid dark matter models
• Viscous dark matter growth in (neo-)Newtonian cosmology
• Could pressureless dark matter have pressure?
• The Central Mass and Phase-Space Densities of Dark Matter Halos: Cosmological Implications
• keV Warm Dark Matter via the Supersymmetric Higgs Portal
• Cosmology of fermionic dark matter
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• Extended Bose-Einstein condensate dark matter in $f(Q)$ gravity
• Dark matter as the Bose-Einstein condensation in loop quantum cosmology
• Hollow cores in Warm Dark Matter halos from the Vlasov-Poisson equation
• On the Tremaine-Gunn Limit with Mass-Varying Particles
• Viscous interacting and stability on dark matter Bose-Einstein condensation with modified Chaplygin gas
• Axion mechanism of Sun luminosity, dark matter and extragalactic background light