Speaker
Description
We present a study of dimensional reduction as a tool for a precise and systematic description of thermally driven electroweak phase transitions (EWPT) in the early universe. Focusing on strong first-order transitions, which are relevant for gravitational wave cosmology, we examine higher-order dimensional reduction, the running of effective parameters within the effective field theory (EFT), and the impact of higher-dimensional operators. This allows us to assess the range of validity and theoretical uncertainties of the EFT approach.
We further demonstrate these results with applications to the Standard Model Effective Field Theory (SMEFT) and singlet extensions of the Standard Model, both of which can realize electroweak phase transitions.