Electroweak baryogenesis at high bubble wall velocities

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http://hdl.handle.net/10138/319333

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Cline , J M & Kainulainen , K 2020 , ' Electroweak baryogenesis at high bubble wall velocities ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol. 101 , no. 6 , 063525 . https://doi.org/10.1103/PhysRevD.101.063525

Title: Electroweak baryogenesis at high bubble wall velocities
Author: Cline, James M.; Kainulainen, Kimmo
Contributor: University of Helsinki, University Management
Date: 2020-03-20
Language: eng
Number of pages: 16
Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology
ISSN: 1550-7998
URI: http://hdl.handle.net/10138/319333
Abstract: 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.
Subject: 114 Physical sciences
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