Neutrino nonstandard interactions via light scalars in the Earth, Sun, supernovae, and the early Universe
Neutrino nonstandard interactions via light scalars in the Earth, Sun, supernovae, and the early Universe
Non-standard interactions (NSI) of neutrinos with matter mediated by a scalar field would induce medium-dependent neutrino masses which can modify oscillation probabilities. Generating observable effects requires an ultra-light scalar mediator. We derive general expressions for the scalar NSI using techniques of quantum field theory at finite density and temperature, including …