# Simulations of Cold Electroweak Baryogenesis: Finding the optimal quench time

## TL;DR

This paper numerically investigates how the speed of electroweak symmetry breaking affects baryon asymmetry in Cold Electroweak Baryogenesis, identifying an optimal quench time for maximum asymmetry and noting sign dependence on quench duration.

## Contribution

It provides a detailed numerical analysis of the dependence of baryon asymmetry on quench time, revealing the optimal conditions for asymmetry generation.

## Key findings

- Maximum asymmetry at quench time ~16/m_H
- No asymmetry for quenches longer than 30/m_H
- Sign of asymmetry depends on quench time

## Abstract

We revisit the numerical computation of the baryon asymmetry from Cold Electroweak Baryogenesis given the physical Higgs mass. We investigate the dependence of the asymmetry on the speed at which electroweak symmetry breaking takes place. The maximum asymmetry does not occur for arbitrarily fast quenches, but at quench times of about $\tau_q\simeq 16\, m_H^{-1}$, with no asymmetry created for quenches slower than $\tau_q>30\, m_H^{-1}$. Curiously, we also find that the overall sign of the asymmetry depends on the quench time.