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Phys."],"published-print":{"date-parts":[[2023,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range 10<jats:sup>14<\/jats:sup> - 10<jats:sup>18<\/jats:sup> kg where the latter may account for all the dark matter.\nWe take into account the leading effects of axion self-interactions, showing that, even though these limit the number of axions produced within each cloud,\na large number of superradiant axions become free of the black hole's gravitational potential and accumulate in the intergalactic medium or even in the host galaxy, depending on their escape velocity.  This means that primordial black hole dark matter may lead to a sizeable astrophysical population of non-relativistic axions, with masses ranging from 0.1 eV to 1 MeV, depending on the primordial black hole mass and spin.\nWe then show that if such axions couple to photons their contribution to the galactic and extragalactic background flux, mainly in the X-ray and gamma-ray band of the spectrum, is already beyond current observational limits for a large range of parameters that are, therefore, excluded. We finish by showing the prospects of the Athena X-ray telescope to further probe this co-existence of primordial black holes and axions.<\/jats:p>","DOI":"10.1088\/1475-7516\/2023\/04\/003","type":"journal-article","created":{"date-parts":[[2023,4,4]],"date-time":"2023-04-04T14:45:14Z","timestamp":1680619514000},"page":"003","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":28,"title":["Superradiant axion clouds around asteroid-mass primordial black holes"],"prefix":"10.1088","volume":"2023","author":[{"given":"Nuno P.","family":"Branco","sequence":"first","affiliation":[]},{"given":"Ricardo Z.","family":"Ferreira","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o G.","family":"Rosa","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2023,4,4]]},"reference":[{"key":"ba05124bfc24e47bb1f0e8c6851a863a8"},{"key":"b582d3ef698537c47731e4540c928f0a8","first-page":"28","article-title":"Amplification of waves reflected from a rotating \u201cblack hole\u201d.","volume":"37","author":"Starobinsky","year":"1973","journal-title":"Sov. 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