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A constraint on light primordial black holes from the interstellar medium temperature
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abstract
Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the Hawking radiation interact with interstellar gas, depositing their energy as heat and ionization. For a sufficiently high Hawking temperature, fast electrons produced by black holes deposit a substantial fraction of energy as heat through the Coulomb interaction. Using the dwarf galaxy Leo T, we place an upper bound on the fraction of primordial black hole dark matter. For $M < 5 \times 10^{-17} M_\odot$, our bound is competitive with or stronger than other bounds.
Forward citations
Cited by 3 Pith papers
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Search for Dark Matter Annihilation and Decay with H$\alpha$ Line Emission
H-alpha line emission from recombining gas in quiet dwarf galaxies is a new probe of dark matter annihilation/decay, giving leading limits for some dark matter masses.
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Picolensing as a Probe of Primordial Black Hole Dark Matter
Asteroid-mass primordial black hole dark matter could be probed by picolensing of gamma-ray bursts, but only with detector separations of at least Earth-L2 distance once realistic GRB size uncertainties are included.
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Searching for Dark Matter with MeVCube
Using Fisher forecasting, the author shows that a 2U to 12U MeVCube CubeSat could probe new dark matter parameter space for evaporating primordial black holes and MeV-scale decaying or annihilating dark matter.
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