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.

52 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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• Singlet-assisted electroweak phase transition at two loops
• On the perturbative expansion at high temperature and implications for cosmological phase transitions
• Baryogenesis and gravity waves from a UV-completed electroweak phase transition
• Robust approach to thermal resummation: Standard Model meets a singlet
• Effective field theory approach to thermal bubble nucleation
• Combining thermal resummation and gauge invariance for electroweak phase transition
• Computing the gauge-invariant bubble nucleation rate in finite temperature effective field theory
• First-order electroweak phase transitions: a nonperturbative update
• Domain walls seeding the electroweak phase transition
• Gravitational waves from supercooled phase transitions: dimensional transmutation meets dimensional reduction
• Electroweak Phase Transition with an SU(2) Dark Sector
• Real scalar phase transitions: a nonperturbative analysis
• Radiative first-order phase transitions to next-to-next-to-leading order
• The Electro-Weak Phase Transition at Colliders: Confronting Theoretical Uncertainties and Complementary Channels
• Strong electroweak phase transition in $t$-channel simplified dark matter models
• Stop comparing resummation methods
• Discerning Singlet and Triplet scalars at the electroweak phase transition and Gravitational Wave
• First-order phase transitions in Twin Higgs models
• $\nu$ Electroweak Baryogenesis: The Scalar Singlet Strikes Back
• Bubble Trouble: a Review on Electroweak Baryogenesis
• A Real Triplet-Singlet Extended Standard Model: Dark Matter and Collider Phenomenology
• Gravitational waves from supercooled phase transitions in conformal Majoron models of neutrino mass
• Non-perturbative determination of the sphaleron rate for first-order phase transitions
• Hard thermal contributions to phase transition observables at NNLO
• Hot news on the phase structure of the SMEFT
• Speed of sound in cosmological phase transitions and effect on gravitational waves