Neutrino- Photon Interactions at Low Energy

Abstract

We discuss $\nu -\gamma$ interactions in the presence of a homogeneous magnetic field with energies less than pair production threshold. The neutrinos are taken to be massless with only standard-model couplings. The magnetic field fulfills the dual purpose of inducing an effective neutrino-photon vertexes and of modifying the photon dispersion relation. Our conclusion is $\nu -\gamma$ interactions are too weak to be of importance for pulsar physics.

Comments: Talk given at the ICTP Workshop on Physics of Relic Neutrino, Trieste, Italy, 16-19 Sep 1998