While primordial black holes (PBHs) with masses $M_{\mathrm{PBH}}\gtrsim {10}^{-11}{M}_{\odot }$ cannot comprise the entirety of dark matter, the existence of even a small population of these objects can have profound astrophysical consequences. A subdominant 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 subdominant 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.

中文翻译：

---

重新审视对原始黑洞周围 WIMP 的限制

而具有质量的原始黑洞 (PBH)${米}_{\mathrm{PBH}}\gtrsim {10}^{-11}{米}_{\odot }$不可能包含整个暗物质，即使是一小部分这些物体的存在也会产生深远的天体物理学后果。PBHs 的次要种群将在物质-辐射平等之前有效地吸积暗物质粒子，从而产生高密度暗物质尖峰。我们在这里考虑暗物质主要由弱相互作用的大质量粒子 (WIMP) 组成的场景，其中来自 PBH 的次要贡献很小，并使用各向同性伽马射线背景的观察重新审视这些尖峰中 WIMP 湮灭的限制(IGRB) 和宇宙微波背景 (CMB)，用于一系列 WIMP 质量、湮没通道、横截面和 PBH 质量函数。我们发现，使用 IGRB 得出的限制被严重高估（在某些情况下高估了许多数量级），并且使用 CMB 观测获得的限制通常比来自 IGRB 的限制更强或可比。重要的是，我们表明$～\mathcal{○}({米}_{\odot })$对于足够低的 WIMP 质量和 p 波湮没截面，PBHs 仍然可以显着促进暗物质密度。