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arXiv 2104.03145astro-ph.COhep-ph
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原初黑洞暗物质的各向同性X射线束缚

Isotropic X-ray bound on Primordial Black Hole Dark Matter

J. Iguaz, P. D. Serpico, T. Siegert

摘要:

我们重新讨论了在质量范围为$10^{16}-10^{18}$ g的各向同性X射线和软γ射线背景下蒸发原始黑洞的约束条件。我们发现,它们比通常推断的更强,这是由于两个被忽略的影响:i)由于蒸发过程中发射的正电子引起的湮灭辐射的贡献。ii)高纬度,银河系对测量的各向同性通量的贡献。我们研究了所使用的数据集,正电子湮没条件,并列入天体物理背景的界限的依赖性。我们推动的排斥限制非自旋PBH与单色质量函数作为整体的暗物质到1.5 $\times 10^{17}\,$ g,这代表了$\sim$ 15 $\%$改善相对于早期的界限,并转化为几乎一个数量级的改善PBH分数在已经探测的区域。我们还表明,包括自旋和/或扩展,对数正态质量函数导致更严格的界限。我们的研究表明,各向同性的流量是一个非常有前途的目标,为未来的任务,在提高灵敏度PBH作为暗物质的候选人。

英文摘要:

We revisit the constraints on evaporating primordial black holes (PBHs) from the isotropic X-ray and soft gamma-ray background in the mass range $10^{16}-10^{18}$ g. We find that they are stronger than usually inferred due to two neglected effects: i) The contribution of the annihilation radiation due to positrons emitted in the evaporation process. ii) The high-latitude, Galactic contribution to the measured isotropic flux. We study the dependence of the bounds from the datasets used, the positron annihilation conditions, and the inclusion of the astrophysical background. We push the exclusion limit for non-spinning PBH with monochromatic mass function as the totality of dark matter to 1.5$\times 10^{17}\,$g, which represents a $\sim$15$\%$ improvement with respect to earlier bounds and translates into almost an order of magnitude improvement in the PBH fraction in the already probed region. We also show that the inclusion of spin and/or an extended, log-normal mass function lead to tighter bounds. Our study suggests that the isotropic flux is an extremely promising target for future missions in improving the sensitivity to PBHs as candidates for dark matter.

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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