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Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
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abstract
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 $m_{\chi}$ and the velocity-averaged annihilation cross-section $\langle \sigma v \rangle$. For the standard scenario with $m_{\chi} = 100\,{\rm GeV}$ and $\langle \sigma v \rangle = 3 \times 10^{-26}\,{\rm cm}^{3} / {\rm s}$, we derive bounds that are stronger than all existing bounds for PBHs with masses $10^{-12}\,M_{\odot} \lesssim M_{\rm BH} \lesssim 10^{4}\,M_{\odot}$, where $M_{\odot}$ is the solar mass, and mostly so by several orders of magnitude.
Forward citations
Cited by 6 Pith papers
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The cosmic history of Primordial Black Hole accretion and its uncertainties
Accounting for radiative feedback and formation-time effects, accretion grows primordial black holes by at most a few percent in the radiation era and negligibly in the baryonic Park-Ricotti model, while the Bondi mod...
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In-depth analysis of the clustering of dark matter particles around primordial black holes. Part II. Analytical prescriptions for spikes
A 'soft' analytical approximation reproduces PBH minispike densities and annihilation rates to ~±15%, and shows that a discovered sub-solar PBH population would strongly constrain s-wave WIMP dark matter.
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Asteroseismological constraints on--and hints of--dark matter interactions
Dark matter heat transport can erase convective cores in solar-mass stars, yielding asteroseismic constraints on dark matter-nucleon scattering and a 4 sigma hint of dark matter-electron scattering in KIC 8228742 that...
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Constraining the Coexistence of Primordial Black Holes and Particle Dark Matter with Neutrino Observations
A refined halo model turns neutrino-telescope data into upper limits on the primordial-black-hole fraction f_PBH, reaching ~10^-8 in some mass ranges for mixed WIMP/FIMP scenarios.
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Constraining primordial black holes and primordial curvature power spectrum with extragalactic muon neutrino
Neutrino flux from WIMP annihilation in PBH-seeded UCMHs yields f_PBH ≲ 4×10^{-5} (strongest) and P_R ≲ 10^{-1.65} at k∼3×10^{12} Mpc^{-1}.
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Asymmetries from a charged memory-burdened PBH
A parameter-space scan shows that very large curvature-current couplings can fit the baryon asymmetry and dark matter abundance, while the electric charge of the black hole plays no role in the mechanism.
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