Primordial Black Hole as a Source of the Boost Factor
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.
Keywords
Cite
@article{arxiv.1009.1947,
title = {Primordial Black Hole as a Source of the Boost Factor},
author = {Ryo Saito and Satoshi Shirai},
journal= {arXiv preprint arXiv:1009.1947},
year = {2011}
}
Comments
17 pages, 3 figure