Positrons from Primordial Black Hole Microquasars and Gamma-ray Bursts

Understand

We propose several novel scenarios how capture of small sublunar-mass primordial black holes (PBHs) by compact stars, white dwarfs or neutron stars, can lead to distinct short gamma-ray bursts (sGRBs) as well as microquasars (MQs).

• In addition to providing new signatures, relativistic jets from these systems will accelerate positrons to high energies.
• We find that if PBHs constitute a sizable fraction of DM, they can significantly contribute to the excess observed in the positron flux by the Pamela, the AMS-02 and the Fermi-LAT experiments.
• Our proposal combines the beneficial features of astrophysical sources and dark matter.