Showing 2026Show all
2 papers · 1 filter
astro-ph.CO2026
Constraints on the Injection of Radiation in the Early Universe
Melissa Joseph, Jason Kumar, Pearl Sandick
We consider the generic injection of radiation (both dark and electromagnetic) during the epoch between big bang nucleosynthesis (BBN) and recombination. The contribution of the ad…
hep-ph2026
Improved supernova bounds on CP-even scalars: cooling and decay constraints
Melissa Joseph, Samuel Liebersbach, Anirudhan A. Madathil +1
Supernovae provide among the most powerful probes of weakly-coupled new particles in the MeV mass range, where laboratory experiments lose sensitivity. In this work, we derive impr…