Electroweak Baryogenesis in the Adiabatic Limit

Abstract

Electroweak baryogenesis can occur in the ``adiabatic limit,'' in which expanding bubbles of true vacuum are assumed to have rather thick walls and be slowly moving. Here the problem of calculating the baryon asymmetry in this limit is reconsidered. A simple prescription for obtaining the relevant kinetic equations is given. An additional suppression beyond that usually assumed is found. This arises because the generation of an asymmetry requires violation of approximately conserved currents by Higgs expectation values, which are small near the front of the walls. As applications, the asymmetries in multi-Higgs models and the minimal supersymmetric standard model are estimated to be proportional to ${\alpha }_w^8$ and ${\alpha }_w^6$ respectively. Also, in this limit the baryon asymmetry in the Minimal Standard Model is extraordinarily small.

Tex file, requires phyzzx, 14 pages, 2 figures (not included), SCIPP preprint 94/01

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• Bounds on Microscopic Physics from P and T Violation in Atoms and Molecules
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• Non-local Electroweak Baryogenesis Part II : The Classical Regime
• Transport equations for chiral fermions to order \hbar and electroweak baryogenesis: Part I
• Turning Around the Sphaleron Bound: Electroweak Baryogenesis in an Alternative Post-inflationary Cosmology
• Diffusion Enhances Spontaneous Electroweak Baryogenesis
• Computing the Strong Sphaleron Rate
• Motion of Chern-Simons Number at High Temperature Under a Chemical Potential
• Classical Field Dynamics of the Electroweak Phase Transition
• The Effects of Electro-weak Phase Transition Dynamics on Baryogenesis and Primordial Nucleosynthesis
• Dynamics of Weak First Order Phase Transitions
• Local and Nonlocal Defect-Mediated Electroweak Baryogenesis
• How pi0 -> gamma gamma changes with temperature
• Adiabatic Electroweak Baryogenesis Driven by an Axion-like Particle
• Anomalous B meson mixing and baryogenesis in a two Higgs doublet model with top-charm flavor violation
• The Chern-Simons diffusion rate in strongly coupled N=4 SYM plasma in an external magnetic field
• Baryogenesis from Domain Walls in the Next-to-Minimal Supersymmetric Standard Model
• Particle Currents on a CP Violating Higgs Background and the Spontaneous Baryogenesis Mechanism
• Resonant Amplification of Electroweak Baryogenesis at Preheating
• Perfect 3-Dimensional Lattice Actions for 4-Dimensional Quantum Field Theories at Finite Temperature
• Electroweak Baryogenesis Using Baryon Number Carrying Scalars
• Anomalous Pseudoscalar-Photon Vertex In and Out of Equilibrium
• CP Violation and the Baryonic Asymmetry of the Universe
• A Self Consistent Study of the Phase Transition in the Scalar Electroweak Theory at Finite Temperature