We investigate low-energy cosmic-ray antiprotons (p¯’s) arising from the fragmentation of quarks and gluons emitted from evaporating primordial black holes (PBHs). To calculate the local interstellar flux of these p¯’s, their propagation in the Galaxy is described by a 3D Monte Carlo simulation based on the diffusion model. This flux is used with recent observations to derive new upper limits on (i) the local PBH explosion rate R < 1.7 × 10−2pc−3yr−1,(ii) the fraction of the Universe’s mass going into PBHs with particular mass, and (iii) the average density of PBHs in the Universe.
ASJC Scopus subject areas
- Physics and Astronomy(all)