Primordial Black Hole as a Source of the Boost Factor
Primordial Black Hole as a Source of the Boost Factor
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DOI：
10.1016/j.physletb.2011.01.038
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发表时间：
2010-09
影响因子：
4.4
通讯作者：
R. Saito;S. Shirai
中科院分区：
文献类型：
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作者：
R. Saito;S. Shirai
如果原始黑洞(PBH)是暗物质(DM)的主要组成部分，那么它们会在周围积累弱相互作用的大质量粒子(WIMP)，并形成超致密的迷你晕(UCMH)。在这封信中，我们讨论了由亚地球质量的PBHs播种的UCMHs增强了当今宇宙中的WIMP湮灭，并成功地解释了Pamela/Fermi实验观察到的宇宙线中的正电子和/或电子过剩。该信号非常类似于衰变暗物质的信号，只要衰变模式正确，就可以解释帕米拉和/或费米反常，而不受任何约束。在这种情况下，提振系数可能高达105。此外，我们还讨论了伽马射线点源和引力波实验的可验证性。
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 105. In addition, we discuss testability of our scenario by gamma-ray point source and gravitational-wave experiments.