Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917895398752256 |
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| author | Korwar, Mrunal Profumo, Stefano |
| author_facet | Korwar, Mrunal Profumo, Stefano |
| contents | 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). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_18656 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses Korwar, Mrunal Profumo, Stefano Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology 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). |
| title | Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.18656 |