Bounds on PBH fraction in a stimulated axion/ALP decay scenario
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| Format: | Preprint |
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2025
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| _version_ | 1866915352518066176 |
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| author | Garnica, Yadir Barranco, J. Ureña-López, Luis A. |
| author_facet | Garnica, Yadir Barranco, J. Ureña-López, Luis A. |
| contents | In this work, we show that stimulated decay of axions or axion-like particles (ALP) in black hole superradiance is an efficient way to find and hunt primordial black holes (PBH). When de Broglie's wavelength of the axion/ ALP is comparable or larger than the black hole horizon radius, a large population of them accumulates in the surroundings of the black hole. When these axions or ALPs couple to photons, the bosonic cloud decays into radiation that contributes to the X-ray, visible light, and radio wave background flux that can exceed current observational limits measured at Earth. If the masses are in the interval of $10^{-3}\mathrm{eV}<μ<1\mathrm{eV}$, to be consistent with current observations of microwave background light, we found that the fraction of primordial black holes should be smaller than $f_{PBH} < 10^{-17}$ for primordial black holes with masses within $10^{-19} M_{\odot}<M_{BH}<10^{-7} M_\odot$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_16579 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bounds on PBH fraction in a stimulated axion/ALP decay scenario Garnica, Yadir Barranco, J. Ureña-López, Luis A. High Energy Physics - Phenomenology General Relativity and Quantum Cosmology In this work, we show that stimulated decay of axions or axion-like particles (ALP) in black hole superradiance is an efficient way to find and hunt primordial black holes (PBH). When de Broglie's wavelength of the axion/ ALP is comparable or larger than the black hole horizon radius, a large population of them accumulates in the surroundings of the black hole. When these axions or ALPs couple to photons, the bosonic cloud decays into radiation that contributes to the X-ray, visible light, and radio wave background flux that can exceed current observational limits measured at Earth. If the masses are in the interval of $10^{-3}\mathrm{eV}<μ<1\mathrm{eV}$, to be consistent with current observations of microwave background light, we found that the fraction of primordial black holes should be smaller than $f_{PBH} < 10^{-17}$ for primordial black holes with masses within $10^{-19} M_{\odot}<M_{BH}<10^{-7} M_\odot$. |
| title | Bounds on PBH fraction in a stimulated axion/ALP decay scenario |
| topic | High Energy Physics - Phenomenology General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.16579 |