1963/04/01 by Edward W. Kolb, I. Tkachev, Igor I. Tkachev +1 · 4 citations
Chemistry · Medicine · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Amplitude #Astrophysics #Atomic physics #Bioinformatics #Biology #Chemistry #Computer science #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Data science #Energy (signal processing) #Healthcare Systems and Public Health #Information retrieval #Isothermal process #Medicine #Particle physics #Physics #Primer (cosmetics) #Quantum mechanics #Thermodynamics #astro-ph
paper · pdf · doi:10.1103/physrevd.50.769
published in California medicine 98(4), 242 (Springer Nature) · 15 pages plus 3 figures (included at the end as a uuencoded postscript file), LaTeX, FNAL--PUB--94/055--A
openalex publication_date 1963/04/01 · arxiv created 1994/03/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/04/28
Large-amplitude isothermal fluctuations in the dark-matter energy density, parametrized by \ensuremathΦ\ensuremath≡\ensuremathδ\mathrm\ensuremathρDM/\mathrm\ensuremathρDM, are studied within the framework of a spherical collapse model. For \ensuremathΦ\ensuremath\gtrsim1, 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 \mathrm\ensuremathρF\ensuremath\approxeq140\mathrm\ensuremathΦ3(\ensuremathΦ+1)\mathrm\ensuremathρeq, where \mathrm\ensuremathρeq is the matter density at equal matter and radiation energy density. This expression is valid for the entire range of possible values of \ensuremathΦ, both for \ensuremathΦ\ensuremath≫1 and \ensuremathΦ\ensuremath≪1. Some astrophysical consequences of high-density dark-matter clumps are discussed.