Phase transitions in dimensional reduction up to three loops Rodríguez Chala, Mikael Gil, Luis Ren, Zhe phase transitions effective field theory renormalization We perform the first computation of phase-transition parameters to cubic order in λ ~ m2 / T2 , where m is the scalar mass and T is the temperature, in a simple model resembling the Higgs sector of the SMEFT. We use dimensional reduction, including 1-loop matching corrections for terms of dimension 6 (in 4-dimensional units), 2- loop contributions for dimension-4 ones and 3-loops for the squared mass. We precisely quantify the size of the different corrections, including renormalization-group running as well as quantum effects from light fields in the effective theory provided by the Coleman-Weinberg potential, and discuss briefly the implications for gravitational waves. Our results suggest that, for strong phase transitions, 1-loop corrections from dimension-6 operators can compete with 2-loop ones from quartic couplings and largely surpass those from 3-loop thermal masses. 2025-10-20T11:42:36Z 2025-10-20T11:42:36Z 2025-07 journal article Mikael Chala et al. 2025. Chinese Phys. C 49 123105, DOI 10.1088/1674-1137/adf322 https://hdl.handle.net/10481/107177 10.1088/1674-1137/adf322 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional IOP Publishing