## Astrophysical limitations on possible tensor contributions to weak neutral-current interactions

We consider the astrophysical implications of, and limits on, possible weak neutral-tensor-current interactions. Such interactions give the neutrino dipole moments that permit it to couple directly to photons. Photons in an astrophysical plasma, with q/sup 2/ not-equal 0, then decay into ..nu..nu-bar pairs. We discuss astrophysical limits, based on a comparison of stellar evolution theory and observations, that can be set on the strength of this modified plasma neutrino-energy loss rate. We find that the best limit is probably set by a comparison of degenerate dwarf cooling times with observations of hot white dwarfs. We deduce that G/subT//G/subF/ approximately-less-than 1/15,more »