Standard Model CP-violation and Cold Electroweak Baryogenesis

TL;DR

This paper uses large-scale lattice simulations to explore whether Standard Model CP-violation can generate the observed baryon asymmetry during a cold electroweak transition, supporting the viability of Cold Electroweak Baryogenesis.

Contribution

It extends previous work by implementing detailed numerical simulations of CP-violation effects in Cold Electroweak Baryogenesis within the Standard Model.

Findings

Standard Model CP-violation can produce the observed baryon asymmetry.

Numerical simulations support the feasibility of Cold Electroweak Baryogenesis.

The study provides detailed methodology for lattice implementation of CP-violating terms.

Abstract

Using large scale real-time lattice simulations, we calculate the baryon asymmetry generated at a fast, cold electroweak symmetry breaking transition. CP-violation is provided by the leading effective bosonic term resulting from integrating out the fermions in the Minimal Standard Model at zero temperature, and performing a covariant gradient expansion [1]. This is an extension of the work presented in [2]. The numerical implementation is described in detail, and we address issues specifically related to using this CP-violating term in the context of Cold Electroweak Baryogenesis. The results support the conclusion of [2], that Standard Model CP-violation may be able to reproduce the observed baryon asymmetry in the Universe in the context of Cold Electroweak Baryogenesis.