Cosmological Magnetic Fields from Gauge-Mediated Supersymmetry-Breaking Models

TL;DR

This paper explores how primordial magnetic fields could originate from gravitational creation of charged scalar particles during reheating, particularly within gauge-mediated supersymmetry-breaking models, potentially explaining observed cosmic magnetic fields.

Contribution

It introduces a mechanism for primordial magnetic field generation via gravitational particle creation in supersymmetry models, linking particle physics with cosmological magnetic phenomena.

Findings

Magnetic fields consistent with observations can be produced if particle lifetime is between 10^{-14} and 10^{-7} seconds.

The mechanism applies to gauge-mediated supersymmetry-breaking models with a lightest stau as the next-to-lightest supersymmetric particle.

Generated magnetic fields can be strong enough to seed galactic dynamos across a range of supersymmetry-breaking scales.

Abstract

We study the generation of primordial magnetic fields, coherent over cosmologically interesting scales, by gravitational creation of charged scalar particles during the reheating period. We show that magnetic fields consistent with those detected by observation may obtained if the particle mean life \tau_s is in the range 10^{-14} sec \leq \tau_s \leq 10{-7} sec. We apply this mechanism to minimal gauge mediated supersymmetry-breaking models, in the case in which the lightest stau \tilde\tau_1 is the next-to-lightest supersymmetric particle. We show that, for a large range of phenomenologically acceptable values of the supersymmetry-breaking scale \sqrt{F}, the generated primordial magnetic field can be strong enough to seed the galactic dynamo.