Papers › Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
Sofiane M. Boucenna, Florian Kuhnel, Tommy Ohlsson, Luca Visinelli
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We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass mᵪ and the velocity-averaged annihilation cross-section ⟨σv ⟩. For the standard scenario with mᵪ = 100 GeV and ⟨σv ⟩= 3 ×10⁻²⁶ cm³ / s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10⁻¹² M_⊙ ≲M_(BH) ≲10⁴ M_⊙, where M_⊙ is the solar mass, and mostly so by several orders of magnitude.
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