Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses
arXiv:2403.18656 · doi:10.1103/PhysRevD.111.023032
Abstract
Black holes long-lived enough to be the dark matter have temperatures below the MeV. Since Hawking evaporation is a quasi-thermal process, no GeV emission is predicted to be produced by black holes if they are part, or all, of the cosmological dark matter. However, black holes could be ``spawned'' at late times with masses that correspond to short lifetimes, and as such be significantly hotter and produce particles well in excess of the GeV. Here we investigate if such late-forming black holes could, at once, explain the tantalizing excesses found in the gamma radiation from the Galactic center, in the flux of cosmic-ray antiproton, and in the few tentative antihelium events reported by the anti-matter spectrometer AMS-02. We find that late-forming black holes cannot simultaneously explain all these excesses. We additionally compute accurate predictions for the anti-deuteron, high-energy neutrino, and positron fluxes if this scenario is realized in nature. We find that while the neutrino and positron fluxes are too small compared to the expected background, a significant number of anti-deuteron events is expected both at AMS-02 and at the future General AntiParticle Spectrometer (GAPS).
8 pages, 3 figures, matches published version
References in corpus (13)
- Background model systematics for the Fermi GeV excess
- Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
- Minimal Dark Matter predictions for galactic positrons, anti-protons, photons
- The characteristics of the Galactic center excess measured with 11 years of Fermi-LAT data
- Fermi-ball dark matter from a first-order phase transition
- Primordial black holes from long-range scalar forces and scalar radiative cooling
- First-order phase transition and fate of false vacuum remnants
- Old Phase Remnants in First Order Phase Transitions
- Les Houches Lectures on Indirect Detection of Dark Matter
- Updated Constraints on Primordial Black Hole Evaporation
- Halo Formation from Yukawa Forces in the Very Early Universe
- Constraints on late-forming exploding black holes
- Fireball baryogenesis from early structure formation due to Yukawa forces