Electroweak baryogenesis at high bubble wall velocities

It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. We rederive fluid equations describing transport of particle asymmetries near the bubble wall without making the...

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Bibliographic Details
Published in:Physical review. D 2020-03, Vol.101 (6), p.1, Article 063525
Main Authors: Cline, James M., Kainulainen, Kimmo
Format: Article
Language:English
Subjects:
Asymmetry
Baryons
Bubbles
Cosmology
Gravitational waves
Phase transitions
Transport equations
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Summary:It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. We rederive fluid equations describing transport of particle asymmetries near the bubble wall without making the small-wall-velocity approximation. We show that the suppression of the baryon asymmetry is a smooth function of the wall speed and that there is no special behavior when crossing the sound speed barrier. Electroweak baryogenesis can thus be efficient also with strong detonations, generically associated with models with observably large gravitational waves. We also make a systematic and critical comparison of our improved transport equations to another one commonly used in the literature, based on the vacuum expectation value (VEV)-insertion formalism.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.101.063525