Bubble wall velocity beyond leading-log approximation in electroweak phase transition

TL;DR

This paper refines the calculation of bubble wall velocity during the electroweak phase transition by going beyond the leading-log approximation, providing more accurate predictions relevant for cosmology.

Contribution

It introduces an improved method for computing the collision term, leading to more precise bubble wall velocity estimates in electroweak phase transition models.

Findings

More accurate bubble wall velocity calculations

Enhanced understanding of phase transition dynamics

Implications for gravitational wave predictions

Abstract

The bubble wall velocity is essential for the phase transition dynamics in the early universe and its cosmological implications, such as the energy budget of phase transition gravitational wave and electroweak baryogenesis. One key factor to determine the wall velocity is the collision term that quantifies the interactions between the massive particles in the plasma and the bubble wall. We improve the calculations of the collision term beyond the leading-log approximation, and further obtain more precise bubble wall velocity for a representative effective model.