1210.1737 (Koichi Funakubo et al.)

Two-loop effective potential, thermal resummation and first-order phase
transitions: Beyond high-temperature expansion    [PDF]

Koichi Funakubo, Eibun Senaha

We formulate a tractable calculation scheme for a finite temperature two-loop resummed effective potential in gauge theories without using a high-temperature expansion. We apply it to the Abelian-Higgs model and its extension to a minimal supersymmetric standard model-like model and study the thermal phase transition. It is shown that our scheme improves the previous results about 10% in the quantities relevant to the phase transition, and its impacts on bubble dynamics could be even more sizable. It still holds that the stop-stop-gluon sunset diagram enhances the strength of the first-order phase transition even without the high-temperature expansion.

View original: http://arxiv.org/abs/1210.1737