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arXiv 2104.09738astro-ph.COgr-qchep-ph
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从CMB和21厘米观测中约束WIMP和原始黑洞的混合暗物质方案

Constraining Mixed Dark-Matter Scenarios of WIMPs and Primordial Black Holes from CMB and 21-cm observations

Hiroyuki Tashiro, Kenji Kadota

摘要:

我们考虑的暗物质(DM)的方案组成的混合物的WIMP和PBH和研究有多少比例的总DM可以PBH。在这种情况下,PBH可以吸积的WIMP,从而增强加热和电离的星系际介质由于WIMP湮灭。我们表明,CMB数据可以给严格的界限上允许的PBH分数是可比的,甚至比那些从伽马射线数据依赖于DM质量更紧。例如,MCMC似然分析使用普朗克CMB数据导致绑定PBH DM分数相对于总的暗物质$f_{\rm PBH} \lesssim {\cal O}( 10^{-10}\sim 10^{-8})$的WIMP质量$m_χ\sim {\cal O}(10\sim 10^3)$ GeV与传统的DM湮灭截面$\langle σv \rangle=3 \times 10^{-26}~\rm cm^3/s $。我们还研究了全球21厘米信号测量的可行性,以提供严格的限制PBH分数。

英文摘要:

We consider the dark matter (DM) scenarios consisting of the mixture of WIMPs and PBHs and study how much fraction of the total DM can be PBHs. In such scenarios, PBHs can accrete the WIMPs and consequently enhance the heating and ionization in the intergalactic medium due to WIMP annihilations. We demonstrate that the CMB data can give the stringent bounds on the allowed PBH fraction which are comparable or even tighter than those from the gamma ray data depending on the DM masses. For instance, the MCMC likelihood analysis using the Planck CMB data leads to the bound on PBH DM fraction with respect to the total dark matter $f_{\rm PBH} \lesssim {\cal O}( 10^{-10}\sim 10^{-8})$ for the WIMP mass $m_χ\sim {\cal O}(10\sim 10^3)$ GeV with the conventional DM annihilation cross section $\langle σv \rangle=3 \times 10^{-26}~\rm cm^3/s $. We also investigate the feasibility of the global 21-cm signal measurement to provide the stringent constraints on the PBH fraction.

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