SCATTERING OF NEUTRINOS AND GRAVITATIONAL-WAVES IN SUPERNOVAE

We consider the scattering of neutrinos and gravitational waves produc ed in supernovae (SN) explosions. Nonlinear scattering processes lead to absorption of neutrinos by the dense plasma surrounding the core, a nd may contribute to reviving the stalled shock wave. We estimate that about 1-10% of the neutrino energy may be absorbed by the plasma A fo rmalism is also presented which describes neutrino oscillations into d ifferent flavours using mode conversion techniques developed for fluid s. Scattering of gravitational waves is also a possibility which may b e important in the propagation and absorption of gravitational radiati on. This scattering may change the expected waveform signal of gravita tional waves.