Primordial black hole as a source of the boost factor

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 01 Feb 2011Embargo end date: 01 Jan 2010 English Publisher:Elsevier BVJournal:Physics Letters B, volume 697, pages 95-100 (issn: 0370-2693,

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Authors: Saito, Ryo; Shirai, Satoshi;

doi: 10.1016/j.physletb.2011.01.038 , 10.48550/arxiv.1009.1947

arXiv: 1009.1947

Primordial black hole as a source of the boost factor

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Abstract

Primordial black holes (PBHs) accumulate weakly interacting massive particles (WIMPs) around them and form ultracompact minihalos (UCMHs), if the WIMP is a dominant component of the dark matter (DM). In this paper, we discuss that the UCMHs seeded by the PBHs with sub-earth mass enhance the WIMP annihilation in the present Universe and can successfully explain the positron and/or electron excess in cosmic ray observed by PAMELA/Fermi experiments. The signal is very similar to that from a decaying dark matter, which can explain the PAMELA and/or Fermi anomaly without conflict with any constraints as long as the decay mode is proper. In this scenario, the boost factor can be as large as 10^5. In addition, we discuss testability of our scenario by gamma-ray point source and gravitational-wave experiments.

17 pages, 3 figure

Related Organizations

University of Tokyo
Japan
Department of Physics - University of Tokyo
Japan

Keywords

High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Astrophysics - Cosmology and Nongalactic Astrophysics

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