论文标题
部分可观测时空混沌系统的无模型预测
Revisiting constraints on WIMPs around primordial black holes
论文作者
论文摘要
虽然带有质量的原始黑洞（PBH）$ m _ {\ rm pbh} \ gtrsim 10^{ - 11} \，m_ \ odot $不能构成全部的暗物质，但这些少数对象的存在也可能产生深远的天体后果。在物质辐射平等之前，PBH的次优势将有效地积聚暗物质颗粒，从而产生高密度的暗物质尖峰。我们在这里考虑深色物质主要由弱相互作用的巨大颗粒（wimps）组成，其中少量的亚持有贡献来自PBHS，并通过使用同型Gamma-ray-ray sbackgack（cosmic of Cosmic Microf）（cosmic Microf）的观测值来重新审视这些尖峰中wimpike的限制。歼灭通道，横截面和PBH质量功能。我们发现，使用IGRB得出的约束已被显着高估（在某些情况下是许多数量级的），并且使用CMB观察结果获得的限制通常比来自IGRB的限制更强或与来自IGRB的限制。重要的是，我们表明$ \ sim \ Mathcal {o}（m_ \ odot）$ pbhs仍然可以为足够低的wimp块和p波歼灭横截面的暗物质密度做出重大贡献。
While Primordial Black Holes (PBHs) with masses $M_{\rm PBH} \gtrsim 10^{-11} \, M_\odot$ cannot comprise the entirety of dark matter, the existence of even a small population of these objects can have profound astrophysical consequences. A sub-dominant population of PBHs will efficiently accrete dark matter particles before matter-radiation equality, giving rise to high-density dark matter spikes. We consider here the scenario in which dark matter is comprised primarily of Weakly Interacting Massive Particles (WIMPs) with a small sub-dominant contribution coming from PBHs, and revisit the constraints on the annihilation of WIMPs in these spikes using observations of the isotropic gamma-ray background (IGRB) and the Cosmic Microwave Background (CMB), for a range of WIMP masses, annihilation channels, cross sections, and PBH mass functions. We find that the constraints derived using the IGRB have been significantly overestimated (in some cases by many orders of magnitude), and that limits obtained using observations of the CMB are typically stronger than, or comparable to, those coming from the IGRB. Importantly, we show that $\sim \mathcal{O}(M_\odot)$ PBHs can still contribute significantly to the dark matter density for sufficiently low WIMP masses and p-wave annihilation cross sections.
