Astrophysical implications of the induced neutrino magnetic moment from large extra dimensions

Abstract

Theories involving extra dimensions, a low (∼TeV) string scale and bulk singlet neutrinos will produce an effective neutrino magnetic moment which may be large (≲10 −11 μ B ). The effective magnetic moment increases with neutrino energy, and therefore high energy reactions are most useful for limiting the allowed number of extra dimensions. We examine constraints from both neutrino-electron scattering and also astrophysical environments. We find that supernova energy loss considerations require a number of extra dimensions, n≥2, for an electron neutrino-bulk neutrino Yukawa coupling of order 1.