Towards an all-orders calculation of the electroweak bubble wall velocity

Understand

We analyze Higgs condensate bubble expansion during a first-order electroweak phase transition in the early Universe.

• The interaction of particles with the bubble wall can be accompanied by the emission of multiple soft gauge bosons.
• When computed at fixed order in perturbation theory, this process exhibits large logarithmic enhancements which must be resummed to all orders when the wall velocity is large.
• We perform this resummation both analytically and numerically at leading logarithmic accuracy.