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arXiv 2109.09575astro-ph.COastro-ph.HE
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河外gamma-ray背景观测对超致密小晕的约束

Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation

Xing-Fu Zhang, Ji-Gui Cheng, Ben-Yang Zhu, Tian-Ci Liu, Yun-Feng Liang, En-Wei Liang

摘要:

超致密微晕(UCMH)是一种特殊的密度分布非常陡峭的暗物质晕,它可能形成于宇宙早期,由过密区域或原始黑洞所孕育。其丰度的限制提供了宝贵的信息的功率谱的原始扰动。在这项工作中,我们更新UCMH丰度在宇宙中使用河外伽玛射线背景(EGB)观测的约束。与以前的工作相比,我们采用了更新的费米-LAT EGB测量和推导的基础上,充分考虑天体物理的贡献约束。有了这些改进,我们把约束UCMH丰度1-2个数量级优于以前的结果。考虑到背景成分,我们还可以尝试寻找已知天体物理贡献之外的其他可能成分。

英文摘要:

Ultracompact minihalo (UCMH) is a special type of dark matter halo with a very steep density profile which may form in the early universe seeded by an overdense region or a primordial black hole. Constraints on its abundance give valuable information on the power spectrum of primordial perturbation. In this work, we update the constraints on the UCMH abundance in the universe using the extragalactic gamma-ray background (EGB) observation. Comparing to previous works, we adopt the updated Fermi-LAT EGB measurement and derive constraints based on a full consideration of the astrophysical contributions. With these improvements, we place constraints on UCMH abundance 1-2 orders of magnitude better than previous results. With the background components considered, we can also attempt to search for possible additional components beyond the known astrophysical contributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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