197 citations · 2k across the 56 of their papers we have counts for
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Cosmological and astrophysical probes of dark baryons
David McKeen, Maxim Pospelov, Nirmal Raj
We examine the cosmological and astrophysical signatures of a "dark baryon," a neutral fermion that mixes with the neutron. As the mixing is through a higher-dimensional operator a…
Observing the thermalization of dark matter in neutron stars
Raghuveer Garani, Aritra Gupta, Nirmal Raj
A promising probe to unmask particle dark matter is to observe its effect on neutron stars, the prospects of which depend critically on whether captured dark matter thermalizes in…
Breaking up the Proton: An Affair with Dark Forces
Graham D. Kribs, David McKeen, Nirmal Raj
Deep inelastic scattering of off protons is sensitive to contributions from "dark photon" exchange. Using HERA data fit to HERA's parton distribution functions, we obtain…
Subaru through a different lens: microlensing by extended dark matter structures
Djuna Croon, David McKeen, Nirmal Raj +1
We investigate gravitational microlensing signals produced by a spatially extended object transiting in front of a finite-sized source star. The most interesting features arise for…
Hydrogen portal to exotic radioactivity
David McKeen, Maxim Pospelov, Nirmal Raj
We show that in a special class of dark sector models, the hydrogen atom can serve as a portal to new physics, through its decay occurring in abundant populations in the Sun and on…
Dark Kinetic Heating of Neutron Stars from Contact Interactions with Relativistic Targets
Aniket Joglekar, Nirmal Raj, Philip Tanedo +1
Dark matter can capture in neutron stars from scattering off ultra-relativistic electrons. We present a method to calculate the capture rate on degenerate targets with ultra-relati…
Gravitational microlensing by dark matter in extended structures
Djuna Croon, David McKeen, Nirmal Raj
Dark matter may be in the form of non-baryonic structures such as compact subhalos and boson stars. Structures weighing between asteroid and solar masses may be discovered via grav…