期刊
PHYSICAL REVIEW D
卷 64, 期 2, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevD.64.027301
关键词
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The low velocity part of a kinetic equilibrium dark matter distribution has a higher phase space density and is more easily incorporated in the 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 nonrelativistic 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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