Constraints on the neutrino magnetic moment from stellar evolution and supernovae type Ia

Abstract

There are several interesting consequences of a neutrino magnetic moment(NMM) such as possibility of a time varying solar neutrino signal (ENS), increased cooling of red giants and enhanced evolution of horizontal branch stars. Earlier Sn 1987A was used to put constraints on NMM. Here we use effects of NMM in preventing carbon-oxygen deflagrations that cause Sn type Ia to give µ/subν<10/sup-13µB. Constraints on CP- violating weak interactions are also put.