Light, asteroid-mass primordial black holes, with lifetimes in the range between hundreds to several millions times the age of the Universe, are well-motivated candidates for the cosmological dark matter. Using archival COMPTEL data, we improve over current constraints on the allowed parameter space of primordial black holes as dark matter by studying their evaporation to soft gamma rays in nearby astrophysical structures. We point out that a new generation of proposed MeV gamma-ray telescopes will offer the unique opportunity to directly detect Hawking evaporation from observations of nearby dark matter dense regions and to constrain, or discover, the primordial black hole dark matter.
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| http://dx.doi.org/10.1103/PhysRevLett.126.171101 | DOI Listing |
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Article Synopsis
- The study focuses on the formation of primordial black holes (PBHs) under ultraslow-roll inflation where stochastic effects play a significant role.
- Using an analytical approach, the researchers analyze the spatial profile of the PBH compaction function and find it to be spiky rather than smooth, challenging existing assumptions in the field.
- Their findings indicate that the abundance of PBHs can be significantly higher than previously thought, leading to a mass distribution that varies widely, suggesting a need for new numerical simulations taking these spiky profiles into account.
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