3 papers
hep-ph2026
Reappraisal of the Constraints on Heavy Axion-like Particles from Gamma-Ray Bursts
Christopher V. Cappiello, Saurav Das, P. S. Bhupal Dev +2
We reassess existing limits and derive new constraints on heavy axion-like particle (ALP) coupling to photons using gamma-ray bursts (GRBs). ALPs can be produced in the hot dense f…
hep-ph2025
Adiabatic Conversion of ALPs into Dark Photon Dark Matter
Edward Broadberry, Saurav Das, Anson Hook +1
We introduce a mechanism by which a misaligned ALP can be dynamically converted into a dark photon in the presence of a background magnetic field. An abundance of non-relativistic…
hep-ph2025
Old neutron stars as a new probe of relic neutrinos and sterile neutrino dark matter
Saurav Das, P. S. Bhupal Dev, Takuya Okawa +1
We study the kinetic cooling (heating) of old neutron stars due to coherent scattering with relic neutrinos (sterile neutrino dark matter) via Standard Model neutral-current intera…