Magnetic Fields from Bubble Collisions - A Progress Report

TL;DR

This paper reports on numerical and analytical studies of magnetic field generation during bubble collisions in early universe phase transitions, highlighting new evidence for electroweak bubble collisions producing magnetic fields.

Contribution

It presents the first analytical evidence that electroweak bubble collisions can generate magnetic fields, expanding understanding of primordial magnetogenesis.

Findings

Magnetic fields are created in U(1) bubble collisions.

Preliminary evidence shows magnetic field generation in electroweak two-bubble collisions.

Numerical and analytical methods complement each other in studying these phenomena.

Abstract

Primordial magnetic fields may be created in collisions of expanding bubbles in a first-order cosmological phase transition and later serve as seed fields for galactic magnetic fields. Here I present results from numerical and analytical studies of U(1) bubble collisions done in collaboration with Ed Copeland and Paul Saffin. I also reveal preliminary results from analytical studies of SU(2)xU(1) bubble collisions, which provide first evidence that magnetic fields are created in electroweak two-bubble collisions.