Multi-messenger Probes of Asteroid Mass Primordial Black Holes: Superradiance Spectroscopy, Hawking Radiation, and Microlensing
arxiv(2024)
摘要
Superradiance provides a unique opportunity for investigating dark sectors as
well as primordial black holes (PBHs), which themselves are candidates for dark
matter (DM) over a wide mass range. Using axion-like particles (ALPs) as an
example, we show that line signals emerging from a superradiated ALP cloud
combined with Hawking radiation from PBHs in extragalactic and galactic halos,
along with microlensing observations lead to complementary constraints on
parameter space combinations including the ALP-photon coupling, ALP mass, PBH
mass, and PBH DM fraction, f_ PBH. For the PBH asteroid mass range
∼10^16-10^22 g, where PBHs can provide the totality of DM, 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 PBH formation mechanism is also considered.
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