Effective Field Theory and Electroweak Baryogenesis in the Singlet-Extended Standard Model

Abstract

Electroweak baryogenesis is a simple and attractive candidate mechanism for generating the observed baryon asymmetry in the Universe. Its viability is sometimes investigated in terms of an effective field theory of the Standard Model involving higher dimension operators. We investigate the validity of such an effective field theory approach to the problem of identifying electroweak phase transitions strong enough for electroweak baryogenesis to be successful. We identify and discuss some pitfalls of this approach due to the modest hierarchy between mass scales of heavy degrees or freedom and the Higgs, and the possibility of dimensionful couplings violating the decoupling between light and heavy degrees of freedom.

18 pages + App. 17 figures. v2, References added

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• First principles determination of bubble wall velocity
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• Bubble Wall Velocity from Holography
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• Probing the Electroweak Sphaleron with Gravitational Waves
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• Does zero temperature decide on the nature of the electroweak phase transition?
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• Vacuum structure and electroweak phase transition in singlet scalar dark matter
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• Primordial Black Holes and Induced Gravitational Waves from a Smooth Crossover beyond Standard Model
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• A Catalog of First-Order Electroweak Phase Transitions in the Standard Model Effective Field Theory