5 papers
Microlensing of fast and slow compact objects
Manish Tamta, Nirmal Raj, Himanshu Verma
Gravitational microlensing constraints on non-standard compact objects are conventionally derived assuming lenses trace the dark matter halo with velocities following a Maxwell-Bol…
Direct detection of electromagnetically interacting ultraheavy dark matter
Jason Kumar, Biprajit Mondal, Girish Muralidhara +1
At a level too faint for astronomy, particle dark matter may interact with Standard Model states via the photon. We derive limits from direct detection experiments on photon-mediat…
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 may constitute all the dark matter. We show that gravitational microlensing of bright x-ray pulsars prov…
Beyond Hawking evaporation of black holes formed by dark matter in compact stars
Ujjwal Basumatary, Nirmal Raj, Anupam Ray
The memory burden effect is an explicit resolution to the information paradox by which an evaporating black hole acquires quantum hair, which then suppresses its rate of mass loss…
Ultraheavy multiscattering dark matter: DUNE, CYGNUS, kilotonne detectors, and tidal streams
Harsh Aggarwal, Nirmal Raj
In direct searches of dark matter, multi-scatter signatures are now being sought to probe scattering cross sections that are large enough to make the detector optically thick to in…