Abstract
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.
Highlights
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 as well as microquasars (MQs)
In this Letter we discuss how PBHs interacting with compact stars can incite distinct gamma-ray burst (GRBs) and microquasar (MQs) sources, which can accelerate particles to high energies and contribute to the positron excess
If a small PBH with sublunar mass of 10−16M MPBH 10−7M is captured by a compact star [50], a white dwarf (WD) or a neutron star (NS), it will eventually consume the host and result in a stellar-mass BH
Summary
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 this Letter we discuss how PBHs interacting with compact stars can incite distinct gamma-ray burst (GRBs) and microquasar (MQs) sources, which can accelerate particles to high energies and contribute to the positron excess. The resulting stellar-mass BH could steadily accrete matter if the considered star system is a binary, powering a microquasar jet.
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