paper

Large-amplitude isothermal fluctuations and high-density dark-matter clumps

arXiv:astro-ph/9403011 · doi:10.1103/PhysRevD.50.769

Abstract

Large-amplitude isothermal fluctuations in the dark matter energy density, parameterized by $Φ\equivδ\rhodm/\rhodm$, are studied within the framework of a spherical collapse model. For $Φ\ga 1$, a fluctuation collapses in the radiation-dominated epoch and produces a dense dark-matter object. The final density of the virialized object is found to be $ρ_F \approx 140\, Φ^3 (Φ+1) \rhoeq$, where $\rhoeq$ is the matter density at equal matter and radiation energy density. This expression is valid for the entire range of possible values of , both for and . Some astrophysical consequences of high-density dark-matter clumps are discussed.

15 pages plus 3 figures (included at the end as a uuencoded postscript file), LaTeX, FNAL--PUB--94/055--A

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