2015/06/30 by Jonathan Kozaczuk · 123 citations
Computer Science · Physics and Astronomy · #Asymmetry #Baryogenesis #Baryon asymmetry #Computational Physics and Python Applications #Cosmology and Gravitation Theories #Electroweak interaction #False vacuum #Particle physics theoretical and experimental studies #Scalar field #Sphaleron #Standard Model (mathematical formulation) #astro-ph.CO #hep-ph #hep-th
paper · pdf · doi:10.1007/jhep10(2015)135
published in Journal of High Energy Physics 2015(10) (Springer Nature) · v2: matches version published in JHEP
openalex publication_date 2015/10/01 · arxiv created 2015/11/11 · arxiv updated 2015/11/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The standard picture of electroweak baryogenesis requires slowly expanding bubbles. This can be difficult to achieve if the vacuum expectation value (VEV) of a gauge singlet scalar field changes appreciably during the electroweak phase transition. It is important to determine the bubble wall velocity in this case, since the predicted baryon asymmetry can depend sensitively on its value. Here, this calculation is discussed and illustrated in the real singlet extension of the Standard Model. The friction on the bubble wall is computed using a kinetic theory approach and including hydrodynamic effects. Wall velocities are found to be rather large (v w ≳ 0.2) but compatible with electroweak baryogenesis in some portions of the parameter space. If the phase transition is strong enough, however, a subsonic solution may not exist, precluding non-local electroweak baryogenesis altogether. The results presented here can be used in calculating the baryon asymmetry in various singlet-driven scenarios, as well as other features related to cosmological phase transitions in the early Universe, such as the resulting spectrum of gravitational radiation.