Gravitational microlensing by dressed primordial black holes

The accretion of dark matter around the primordial black holes (PBHs) could lead to formation surrounding minihalos, whose mass can be several orders magnitude higher than central PBH mass. gravitational microlensing produced by such dressed PBHs quite different from that bare PBHs, which may significantly affect constraints on abundance. In this paper, we study in detail. We find all effects have asymptotic behavior depending minihalo size, used predict comparing halo size with Einstein radius. When radius and are comparable, effect density distribution is significant microlensing. Applying stellar data Optical Gravitational Lensing Experiment Subaru/HSC Andromeda observations, obtain improved It shows existence minihalos strengthen abundance orders, shift well-known asteroid window where constitute matter.