Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

Abstract

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 ${\Omega }_{\mathrm{DM}}\approx 0.26$. However, previous studies have highlighted that scenarios with both particle dark matter and PBH are strongly excluded by $\gamma$-ray limits for particle dark matter with a velocity independent thermal cross section $⟨\sigma v⟩\sim 3\times 10^{-26}{\mathrm{cm}}^3/\mathrm{s}$, 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 $\gamma$-rays on velocity dependent annihilations which are $p$-wave with $⟨\sigma v⟩\propto v^2$ or $d$-wave with $⟨\sigma v⟩\propto v^4$, 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 $\gamma$-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 $\gamma$-ray bounds.

37 pages, 11 Figures

References in corpus (46)

• Observational evidence for self-interacting cold dark matter
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Constraints on Primordial Black Holes
• Dark Matter Self-interactions and Small Scale Structure
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Primordial Black Holes as Dark Matter: Recent Developments
• Primordial black hole constraints for extended mass functions
• Cosmological dark matter annihilations into gamma-rays - a closer look
• Growth of structure seeded by primordial black holes
• Spins of primordial black holes formed in the matter-dominated phase of the Universe
• Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
• A New Probe of Dark Matter and High-Energy Universe Using Microlensing
• Matrix element analyses of dark matter scattering and annihilation
• Fitting the Galactic Center Gamma-Ray Excess with Cascade Annihilations
• WIMPs and stellar-mass primordial black holes are incompatible
• Gamma ray constraints on Decaying Dark Matter
• Constraints on Primordial Black Holes with Extended Mass Functions
• Primordial Black Holes as Dark Matter: Almost All or Almost Nothing
• Bondi accretion in the early universe
• Spin of Primordial Black Holes
• Gamma rays from ultracompact primordial dark matter minihalos
• What if Planet 9 is a Primordial Black Hole?
• Scalar Dark Matter Models with Significant Internal Bremsstrahlung
• Constraints on decaying dark matter from the extragalactic gamma-ray background
• Spin Distribution of Primordial Black Holes
• Dark Matter Density Spikes around Primordial Black Holes
• Black Holes and WIMPs: All or Nothing or Something Else
• Photon spectra from WIMP annihilation
• Fitting formulae for photon spectra from WIMP annihilation
• Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
• Primordial Black Holes from Confinement
• In-depth analysis of the clustering of dark matter particles around primordial black holes I: density profiles
• Constraints on a mixed model of dark matter particles and primordial black holes from the Galactic 511 keV line
• Strong CMB Constraint On P-Wave Annihilating Dark Matter
• A black hole window into p-wave dark matter annihilation
• Primordial Black Holes as Silver Bullets for New Physics at the Weak Scale
• Effective $J$-factors for Milky Way dwarf spheroidal galaxies with velocity-dependent annihilation
• Enhancing Dark Matter Annihilation Rates with Dark Bremsstrahlung
• Constraining Mixed Dark-Matter Scenarios of WIMPs and Primordial Black Holes from CMB and 21-cm observations
• Spin of primordial black holes in the model with collapsing domain walls
• The Habitability of the Galactic Bulge
• Stochastic Correlation Model of Galactic Bulge Velocity Dispersions and Central Black Holes Masses
• Primordial black hole dark matter in the presence of p-wave WIMP annihilation
• Studies of a thermally averaged p-wave Sommerfeld factor
• Faint Dark Matter Annihilation Signals and the Milky Way's Supermassive Black Hole
• Radio bounds on the mixed dark matter scenarios of primordial black holes and WIMPs

Cited by in corpus (2)

• Constraining the Coexistence of Freeze-in Dark Matter and Primordial Black Holes
• In-depth analysis of the clustering of dark matter particles around primordial black holes. Part III: CMB constraints