Papers › Multi-messenger Probes of Asteroid Mass Primordial Black Holes: Superradiance...
Multi-messenger Probes of Asteroid Mass Primordial Black Holes: Superradiance Spectroscopy, Hawking Radiation, and Microlensing
James B. Dent, Bhaskar Dutta, Tao Xu
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Superradiance provides a unique opportunity for investigating dark sectors as well as primordial black holes, which themselves are candidates for dark matter over a wide mass range. Using axion-like particles as an example, we show that line signals emerging from a superradiated axion cloud combined with black hole Hawking radiation in extragalactic and galactic halos, along with microlensing observations lead to complementary constraints on parameter space combinations including the axion-photon coupling, axion mass, black hole mass, and its dark matter fraction, f_(PBH). For the asteroid mass range ∼10¹⁶-10²² g, where primordial black holes can provide the totality of dark matter, we demonstrate that ongoing and upcoming observations such as SXI, JWST, and AMEGO-X will be sensitive to possible line and continuum signals, respectively, providing probes of previously inaccessible regions of f_(PBH) parameter space. Further complementarity from a stochastic gravitational-wave background emerging from the black hole formation mechanism is also considered.
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