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The Abundance of New Kind of Dark Matter Structures

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arxiv 1112.6228 v1 pith:DXTHTS5Z submitted 2011-12-29 astro-ph.HE

The Abundance of New Kind of Dark Matter Structures

classification astro-ph.HE
keywords darkmatterucmhsabundanceannihilationdensityevolutionkind
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A new kind of dark matter structures, ultracompact minihalos (UCMHs) was proposed recently. They would be formed during the radiation dominated epoch if the large density perturbations are existent. Moreover, if the dark matter is made up of weakly interacting massive particles, the UCMHs can have effect on cosmological evolution because of the high density and dark matter annihilation within them. In this paper, one new parameter is introduced to consider the contributions of UCMHs due to the dark matter annihilation to the evolution of cosmology, and we use the current and future CMB observations to obtain the constraint on the new parameter and then the abundance of UCMHs. The final results are applicable for a wider range of dark matter parameters

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Cited by 1 Pith paper

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  1. Constraining primordial black holes and primordial curvature power spectrum with extragalactic muon neutrino

    astro-ph.CO 2026-07 conditional novelty 4.0

    Neutrino flux from WIMP annihilation in PBH-seeded UCMHs yields f_PBH ≲ 4×10^{-5} (strongest) and P_R ≲ 10^{-1.65} at k∼3×10^{12} Mpc^{-1}.