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- W4381245644 abstract "In the string axiverse scenario, light primordial black holes may spin up due to the Hawking emission of a large number of light (sub-MeV) axions. We show that this may trigger superradiant instabilities associated with a heavier axion during the black holes' evolution, and study the coupled dynamics of superradiance and evaporation. We find, in particular, that the present black hole mass-spin distribution should follow the superradiance threshold condition for black hole masses below the value at which the superradiant cloud forms, for a given heavy axion mass. Furthermore, we show that the decay of the heavy axions within the superradiant cloud into photon pairs may lead to a distinctive line in the black hole's emission spectrum, superimposed on its electromagnetic Hawking emission." @default.
- W4381245644 created "2023-06-20" @default.
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- W4381245644 date "2023-06-15" @default.
- W4381245644 modified "2023-10-18" @default.
- W4381245644 title "Primordial black hole superradiance and evaporation in the string axiverse" @default.
- W4381245644 doi "https://doi.org/10.48550/arxiv.2306.09430" @default.
- W4381245644 hasPublicationYear "2023" @default.
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