期刊
PHYSICS LETTERS B
卷 697, 期 2, 页码 95-100出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.01.038
关键词
Cosmic-ray positron excess; Boost factor; Primordial black holes
资金
- JSPS
- World Premier International Research Center Initiative, MEXT, Japan
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 Letter, 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. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据