AI 中文总结
研究小行星质量窗口的原初黑洞暗物质，通过计算旋转PBHs超辐射产生的中微子通量，并与现有反中微子极限比较，发现能强烈约束该质量窗口部分范围，提供了区别于霍金蒸发的PBH DM互补中微子探测法。
AI 中文摘要
原初黑洞（PBHs）是暗物质（DM）的一个有吸引力的候选者，人们已进行了广泛的实验来寻找它们。小行星质量窗口，$M_{\text{PBH}} \sim 10^{17} - 10^{23}$ g，特别有趣，因为这个范围内的PBHs仍可能构成全部暗物质。本文研究一种情况，即旋转的PBHs被超辐射产生的玻色子云包围，这些玻色子云发射出能量在几MeV范围内近似稳定且近乎单色的中微子通量。我们计算了来自此类PBH群体的银河系和星系外中微子通量，并将它们与来自Borexino、KamLAND和Super-Kamiokande的现有低能反中微子极限进行比较。对于标量玻色子，我们发现这些中微子搜索可以强烈约束小行星质量窗口的很大一部分，并扩展到稍大质量。例如，对于自旋ã = 0.9且引力精细结构耦合$\alpha_g = 0.25$的快速旋转PBHs，对于汤川耦合$g_{\nu \phi} = 10^{-4}$，在$M_{\text{PBH}} \sim 2 \times 10^{22}$ g附近，暗物质分数的最强限制约为$f_{\text{PBH}} \sim 10^{-7}$。这些限制可能比相同质量范围内现有的微透镜限制要强得多。我们的结果提供了一种与之前主要基于较轻PBHs霍金蒸发的中微子约束不同的PBH DM互补中微子探测方法。
英文摘要
Primordial Black Holes (PBHs) are an attractive candidate for Dark Matter (DM) and there has been extensive experimental efforts to look for them. The asteroid-mass window, $M_{\text{PBH}} \sim 10^{17} - 10^{23}$ g, is particularly interesting, since PBHs in this range may still constitute all of DM. In this work, we study a scenario in which rotating PBHs are surrounded by superradiantly produced boson clouds that emit an approximately steady and nearly monochromatic flux of neutrinos in the few MeV range. We compute both the Galactic and extragalactic neutrino fluxes from such PBH populations and compare them with existing low-energy antineutrino limits from Borexino, KamLAND, and Super-Kamiokande. For scalar bosons, we find that these neutrino searches can strongly constrain a significant part of the asteroid-mass window and extend to somewhat larger masses. For instance, for rapidly rotating PBHs with spin ã = 0.9 and gravitational fine-structure coupling $α_g=0.25$, the strongest bound on dark matter fraction reaches approximately $f_{\text{PBH}} \sim 10^{-7}$ around $M_{\text{PBH}} \sim 2 \times 10^{22}$ g for a Yukawa coupling $g_{νϕ} = 10^{-4}$. These constraints can be significantly stronger than existing microlensing limits in the same mass range. Our results provide a complementary neutrino probe of PBH DM, distinct from previous neutrino constraints based mainly on Hawking evaporation from lighter PBHs.
Comments25 pages, 8 figures
