Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 3 figures, talk given at the Trieste meeting of the TMR Network on Physics beyond the SM, February 1999, Trieste, Ita
Scientific paper
We summarize recent work on the consistent calculation of bubble-nucleation rates. Our approach is based on the notion of a real coarse-grained potential. The bubble-nucleation rate is calculated through an expansion around the semiclassical saddle point associated with tunnelling. We resolve outstanding problems related to the convexity of the potential, the double-counting of the effect of fluctuations and the inherent ultraviolet divergences. We determine the region of validity of the expansion around the saddle point. We find that this expansion fails near the spinodal line, and for weak or radiatively-induced first-order phase transitions. We apply our method to the bound on the Higgs-boson mass from vacuum metastability and the electroweak phase transition.
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