Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes
arxiv(2022)
摘要
Cosmology may give rise to appreciable populations of both particle dark
matter and primordial black holes (PBH) with the combined mass density
providing the observationally inferred value Ω_ DM≈0.26.
However, previous studies have highlighted that scenarios with both particle
dark matter and PBH are strongly excluded by γ-ray limits for particle
dark matter with a velocity independent thermal cross section ⟨σ
v⟩∼3×10^-26 cm^3/ s, as is the case for classic WIMP
dark matter. Here we extend these existing studies on s-wave annihilating
particle dark matter to ascertain the limits from diffuse γ-rays on
velocity dependent annihilations which are p-wave with ⟨σ v
⟩∝ v^2 or d-wave with ⟨σ v ⟩∝ v^4,
which we find to be considerably less constraining. Furthermore, we highlight
that even if the freeze-out process is p-wave it is relatively common for
(loop/phase-space) suppressed s-wave processes to actually provide the
leading contributions to the experimentally constrained γ-ray flux from
the PBH halo. This work also utilyses a refined treatment of the PBH dark
matter density profile and outlines an improved application of extra-galactic
γ-ray bounds.
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