Production of relic gravitational waves and the baryon asymmetry of the universe by random hypermagnetic fields

TL;DR

This paper investigates how hypermagnetic fields in the early universe influence the production of relic gravitational waves and baryon asymmetry, providing numerical solutions and constraints on seed field strengths.

Contribution

It introduces a comprehensive kinetic model for hypermagnetic fields and particle asymmetries, linking seed magnetic spectra to gravitational wave and baryon asymmetry production.

Findings

Predicted the energy spectrum of primordial gravitational waves.

Derived the baryon asymmetry generated by lepton asymmetries.

Constrained seed hypermagnetic field strengths based on results.

Abstract

We study the evolution of hypermagnetic fields (HMFs) in random plasma in the symmetric phase of the early universe. The system of kinetic equations for the spectra of the energy density and the helicity, as well as the particles asymmetries is derived. We also formulate the initial condition which involve the Kazantsev and Kolmogorov spectra of the seed HMFs. This system is solved numerically. We predict the energy spectrum of primeval gravitational waves which are produced by these HMFs. Additionally, the baryon asymmetry of the universe, generated by the lepton asymmetries, is obtained. These results allow us to constrain the strength of seed HMFs.