Speaker
Henry Stubbs
(University of Oxford)
Description
The observations of supernovae can place strong bounds on the couplings of particles beyond the standard model, with masses all the way up to ~200MeV. We study new scalar particles and show that for masses less than the plasma frequency in the supernova core, they are predominantly produced by resonant mixing with an emergent in-medium degree of freedom known as the longitudinal photon. Unlike the nucleon-nucleon bremsstrahlung production mechanism which dominates at larger masses, this mechanism is free from nuclear physics uncertainties.
Primary author
Henry Stubbs
(University of Oxford)
