Instantaneous Power Radiated from Magnetic Dipole Moments

TL;DR

This paper calculates the instantaneous power radiated by moving magnetic dipoles in different regimes and explores implications for astrophysical and cosmological phenomena, including neutrino cooling in the early universe.

Contribution

It introduces a comprehensive calculation of radiated power from magnetic dipoles, extending to relativistic speeds and diverse physical contexts, including cosmology.

Findings

Magnetic dipole radiation can be significant in astrophysical processes.

Neutrino radiation cooling may occur under early-universe conditions.

The model applies to solar, accelerator, and cosmological scenarios.

Abstract

We compute the power radiated per unit solid angle of a moving magnetic dipole moment, and its instantaneous radiated power, both non-relativistically and relativistically. This is then applied to various interesting situations: solar neutrons, electron synchrotrons and cosmological Dirac neutrinos. Concerning the latter, we show that hypothesized early-universe Big Bang conditions allow for neutrino radiation cooling and provide an energy loss-mechanism for subsequent neutrino condensation.