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题名: Dark-matter decay and the abundance of ultracompact minihalos
作者: Yang, YP ;  Yang, GL ;  Zong, HS
刊名: EPL
出版日期: 2013
卷号: 101, 期号:6, 页码:69001
关键词: PRIMORDIAL BLACK-HOLES ;  UNIVERSE ;  CONSTRAINTS ;  SPECTRUM ;  PROBE
学科分类: Physics
通讯作者: Yang, YP (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China.
部门归属: [Yang, Yu-Peng; Yang, Gui-Lin; Zong, Hong-Shi] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China; [Yang, Yu-Peng] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China; [Yang, Yu-Peng; Yang, Gui-Lin; Zong, Hong-Shi] Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China; [Zong, Hong-Shi] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
英文摘要: Ultracompact minihalos would be formed if there are larger density perturbations (0.0003 < delta rho/rho < 0.3) in the earlier epoch. Their density profile is steeper than the standard dark-matter halos. If dark matter can annihilate or decay into standard particles, e. g., photons, these objects would be the potential astrophysical sources. In order to be consistent with observations, as those from Fermi, the abundance of ultracompact minihalos must be constrained. On the other hand, the formation of these objects has very tight relation with the primordial curvature perturbations on smaller scale, so the fraction of ultracompact minihalos is very important for modern cosmology. In previous works, the studies are focused on the dark-matter annihilation for these objects. But if dark matter is not annihilated, the dark-matter decay is another important possible case. On the other hand, the abundance of ultracompact minihalos is related to many other parameters, such as the mass of dark matter, the decay channels and the density profile of dark-matter halos. One of the important aspects of this work is that we investigate the gamma-ray signals from nearby ultracompact minihalos due to dark-matter decay and another important aspect is to study in detail how the different decay channels and density profiles affect the constraints on the abundance of ultracompact minihalos. Copyright (C) EPLA, 2013
资助者: National Natural Science Foundation of China [10935001, 11075075]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000317918300037
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15408
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Yang, YP,Yang, GL,Zong, HS. Dark-matter decay and the abundance of ultracompact minihalos[J]. EPL,2013,101(6):69001.
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