Astrophysical Implications of the Induced Neutrino Magnetic Moment from Large Extra Dimensions

TL;DR

This paper explores how theories with extra dimensions can lead to an enhanced neutrino magnetic moment, affecting astrophysical processes and providing constraints on the number of extra dimensions based on supernova energy loss.

Contribution

It introduces the concept that large extra dimensions can induce a significant neutrino magnetic moment, linking particle physics with astrophysical observations.

Findings

Neutrino magnetic moment can be as large as 10^{-11} mu_B.

Supernova energy loss constrains the number of extra dimensions to n > 1.

High-energy reactions are most effective for probing 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} mu_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 > 1, for an electron neutrino-bulk neutrino Yukawa coupling of order 1.