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Résumé |
Primordial black holes (PBHs), possibly formed via gravitational collapse of large
density perturbations in the very early universe, are one of the earliest proposed
and viable dark matter (DM) candidates. PBHs can make up a large or even entirety
of DM over a wide range of masses. Ultralight PBHs in the mass range of 10^{15} -
10^{17} g, emit particles via Hawking radiation, act as a decaying DM, and can be
probed via observations of those emitted particles in various space as well as
ground based detectors. In this talk, I will discuss how diffuse supernova
neutrino background searches at the Super-Kamiokande neutrino observatory,
measurement of the 511 keV gamma-ray line by INTEGRAL telescope, future
observations of low energy Galactic Center photons by the imminent soft gamma-ray
telescope AMEGO, and EDGES measurement of the global 21-cm signal can set robust,
world-leading exclusions on the fraction of DM composed of ultralight PBHs.
Finally, I will also discuss a novel formation mechanism of low mass transmuted
black holes which can be a viable non-primordial solution to sub-Chandrasekhar
mass, pointing out several avenues to test the transmuted origin of low mass black
holes.
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