Breaking into the window of primordial black hole dark matter with x-ray microlensing

Manish Tamta, Nirmal Raj, Prateek Sharma

Primordial black holes (PBHs) in the mass range $10^{-16}-10^{-11}{M}_{\odot }$ may constitute all the dark matter. We show that gravitational microlensing of bright x-ray pulsars prov…