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arXiv 2201.04946astro-ph.COastro-ph.HEgr-qchep-th
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亮原初黑洞的暗辐射约束

Dark radiation constraints on light primordial black holes

Jérémy Auffinger, Alexandre Arbey, Pearl Sandick, Barmak Shams Es Haghi, Kuver Sinha

摘要:

轻黑洞可能在非常早期的宇宙中通过巨大的原始密度波动的坍缩而形成。这些原始的黑洞(PBH),如果足够轻的话,由于霍金辐射的发射,现在已经蒸发了;因此它们不可能代表今天暗物质的相当大的一部分。然而,它们可能在早期宇宙学时代留下了印记。我们将讨论在大爆炸核合成(BBN)开始之前由(旋转)PBH发射的无质量引力子的影响,并得出结论,这种对暗辐射的贡献受到宇宙微波背景(CMB)(未来CMB阶段4)和BBN在PBH质量范围的较轻部分的限制,假设它们主导宇宙的能量密度。

英文摘要:

Light black holes could have formed in the very early universe through the collapse of large primordial density fluctuations. These primordial black holes (PBHs), if light enough, would have evaporated by now because of the emission of Hawking radiation; thus they could not represent a sizable fraction of dark matter today. However, they could have left imprints in the early cosmological epochs. We will discuss the impact of massless graviton emission by (rotating) PBHs before the onset of big bang nucleosynthesis (BBN) and conclude that this contribution to dark radiation is constrained by the cosmic microwave background (CMB) (with the future CMB Stage 4) and BBN in the lighter portion of the PBH mass range, under the hypothesis that they dominated the energy density of the universe.

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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