Dimensional reduction of the Standard Model coupled to a new singlet scalar field

Abstract

We derive an effective dimensionally reduced theory for the Standard Model augmented by a real singlet scalar. We treat the singlet as a superheavy field and integrate it out, leaving an effective theory involving only the Higgs and $\mathrm{SU}(2{)}_{\mathrm{L}}\times \mathrm{U}(1{)}_Y$ gauge fields, identical to the one studied previously for the Standard Model. This opens up the possibility of efficiently computing the order and strength of the electroweak phase transition, numerically and nonperturbatively, in this extension of the Standard Model. Understanding the phase diagram is crucial for models of electroweak baryogenesis and for studying the production of gravitational waves at thermal phase transitions.

arXiv comment52 pages, 3 figures; v2: references added, additional discussion of temporal gluons, discussion extended with some parameter space scans, published in JHEP

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