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arXiv 2104.04051astro-ph.COastro-ph.HEgr-qchep-ph
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自旋原初黑洞和早期物质主导时代暗辐射的精确计算

Precision Calculation of Dark Radiation from Spinning Primordial Black Holes and Early Matter Dominated Eras

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

摘要:

我们提出了精确的计算暗辐射的形式引力子来自霍金蒸发的旋转原始黑洞(PBH)在早期宇宙。我们的计算采用了一个仔细的治疗扩展自旋分布的人口的PBH,PBH再加热温度,和相对论自由度的数量。我们将我们的精度结果与文献中现有的结果进行比较,并显示了BBN和CMB暗辐射的当前界限对PBH的限制,以及CMB第4阶段实验的预计灵敏度。作为一个应用程序,我们认为PBH的情况下形成的早期物质主导时代(EMDE)。我们计算引力子生产从各种PBH自旋分布相关的EMDE,并发现PBH在整个质量范围内的$10^9\,$ g将受到约束的测量从CMB阶段4的实验,假设PBH来支配宇宙之前霍金蒸发。我们还发现,对于PBH与单色自旋$a^*>0.81$,所有PBH质量范围内的$10^{-1}\,{\rm g} < M_{\rm BH} <10^9\,$ g将探测CMB阶段4实验。

英文摘要:

We present precision calculations of dark radiation in the form of gravitons coming from Hawking evaporation of spinning primordial black holes (PBHs) in the early Universe. Our calculation incorporates a careful treatment of extended spin distributions of a population of PBHs, the PBH reheating temperature, and the number of relativistic degrees of freedom. We compare our precision results with those existing in the literature, and show constraints on PBHs from current bounds on dark radiation from BBN and the CMB, as well as the projected sensitivity of CMB Stage 4 experiments. As an application, we consider the case of PBHs formed during an early matter-dominated era (EMDE). We calculate graviton production from various PBH spin distributions pertinent to EMDEs, and find that PBHs in the entire mass range up to $10^9\,$g will be constrained by measurements from CMB Stage 4 experiments, assuming PBHs come to dominate the Universe prior to Hawking evaporation. We also find that for PBHs with monochromatic spins $a^*>0.81$, all PBH masses in the range $10^{-1}\,{\rm g} < M_{\rm BH} <10^9\,$g will be probed by CMB Stage 4 experiments.

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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