Contributions of dark matter annihilation within ultracompact minihalos to the 21 cm background signal

被引：17
作者：
Yang, Yupeng [1 ,2 ]
机构：
[1] Anyang Normal Univ, Coll Phys & Elect Engn, Anyang 455000, Peoples R China
[2] Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL PLUS | 2016年 / 131卷 / 12期
基金：
美国国家科学基金会;
关键词：
INTERGALACTIC MEDIUM; SPIN TEMPERATURE; REIONIZATION; CONSTRAINTS; BRIGHTNESS; ABUNDANCE; EPOCH;
D O I：
10.1140/epjp/i2016-16432-8
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In the dark age of the Universe, any exotic sources, e.g. the dark matter annihilation, which inject the energy into the intergalactic medium (IGM) will left some imprint on the 21 cm background signal. Recently, one new kind of dark matter structure named ultracompact dark matter minihalos (UCMHs) was proposed. Near the inner part of UCMHs, the distribution of dark matter particles is steeper than that of the general dark matter halos, rho UCMHs(r) similar to r(-2.)25, and the formation time of UCMHs is earlier, z(c) similar to 1000. Therefore, it is excepted that the dark matter annihilation within UCMHs can effect the 21 cm background signal. In this paper, we investigated the contributions of the dark matter annihilation within UCMHs to the 21 cm background signal.
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页数：8
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