论文标题
旋转PBH支配和蒸发的独特签名：双峰引力波，黑暗遗物和CMB互补性
Distinct signatures of spinning PBH domination and evaporation: doubly peaked gravitational waves, dark relics and CMB complementarity
论文作者
论文摘要
超低质量原始黑洞（PBH）可能会短暂地主导宇宙的能量密度，但在大爆炸核合成（BBN）之前完全蒸发，可以导致有趣的观察性特征。 In our previous work, we studied the generation of a doubly peaked spectrum of induced stochastic gravitational wave background (ISGWB) for such a scenario and explored the possibility of probing a class of baryogenesis models wherein the emission of massive unstable particles from the PBH evaporation and their subsequent decay contributes to the matter-antimatter asymmetry.在这项工作中，我们通过包括旋转PBH的范围来扩展早期工作的范围，并考虑光相对论暗区颗粒的发射，这有助于黑暗辐射（DR）和巨大的稳定的深色扇形颗粒，从而考虑了宇宙的暗物质（DM）成分。 ISGWB可以探测这些重型DM颗粒的非热产生，在实验室搜索中无法访问。对于DR的情况，我们发现这些发射粒子的$Δn_ {\ rm eff} $的测量结果与PBH统治中的ISGWB之间有一种新颖的互补性。我们的结果表明，ISGWB对初始PBH自旋的依赖性较弱。但是，对于作为DR颗粒的引力，初始PBH旋转起着重要的作用，并且仅高于初始自旋参数$ a _*$的临界值，仅取决于初始PBH质量，可以在CMB-HD实验中探测Graviton发射。即将进行的CMB实验，例如CMB-HD和CMB-Bharat，以及Lisa和ET等未来的GW探测器，为限制PBHS参数空间的令人兴奋的可能性提供了更深入的深入了解，从而为宇宙的扩张历史提供了更深入的见解。
Ultra-low mass primordial black holes (PBH), which may briefly dominate the energy density of the universe but completely evaporate before the big bang nucleosynthesis (BBN), can lead to interesting observable signatures. In our previous work, we studied the generation of a doubly peaked spectrum of induced stochastic gravitational wave background (ISGWB) for such a scenario and explored the possibility of probing a class of baryogenesis models wherein the emission of massive unstable particles from the PBH evaporation and their subsequent decay contributes to the matter-antimatter asymmetry. In this work, we extend the scope of our earlier work by including spinning PBHs and consider the emission of light relativistic dark sector particles, which contribute to the dark radiation (DR) and massive stable dark sector particles, thereby accounting for the dark matter (DM) component of the universe. The ISGWB can probe the non-thermal production of these heavy DM particles, which cannot be accessible in laboratory searches. For the case of DR, we find a novel complementarity between the measurements of $ΔN_{\rm eff}$ from these emitted particles and the ISGWB from PBH domination. Our results indicate that the ISGWB has a weak dependence on the initial PBH spin. However, for gravitons as the DR particles, the initial PBH spin plays a significant role, and only above a critical value of the initial spin parameter $a_*$, which depends only on initial PBH mass, the graviton emission can be probed in the CMB-HD experiment. Upcoming CMB experiments such as CMB-HD and CMB-Bharat, together with future GW detectors like LISA and ET, open up an exciting possibility of constraining the PBHs parameter space providing deeper insights into the expansion history of the universe between the end of inflation and BBN.
