Matter-antimatter origin of cosmic magnetism

TL;DR

This paper proposes that the primordial antimatter, specifically positrons, contributed to the origin of cosmic magnetic fields through their magnetic properties in the early universe.

Contribution

It introduces a novel hypothesis linking antimatter in the early universe to cosmic magnetism and quantitatively evaluates the magnetic polarization asymmetry needed for self-magnetization.

Findings

Positrons in the early universe could generate magnetic fields.

Quantitative estimates of the magnetic polarization asymmetry required.

Supports the matter-antimatter origin hypothesis for cosmic magnetism.

Abstract

We explore the hypothesis that the abundant presence of relativistic antimatter (positrons) in the primordial universe is the source of the intergalactic magnetic fields we observe in the universe today. We evaluate both Landau diamagnetic and magnetic dipole moment paramagnetic properties of the very dense primordial electron-positron $e^{+}e^{-}$-plasma, and obtain in quantitative terms the relatively small magnitude of the $e^{+}e^{-}$ magnetic moment polarization asymmetry required to produce a consistent self-magnetization in the universe.