Generating the Baryon Asymmetry of the Universe in Split Fermion Models

Abstract

The origin of the matter-antimatter asymmetry of the universe is one of the major unsolved problems in cosmology and particle physics. In this paper, we investigate the recently proposed possibility that split fermion models -- extra dimensional models where the standard model fermions are localized to different points around the extra dimension -- could provide a means to generate this asymmetry during the phase transition of the localizing scalars. After setting up the scenario that we consider, we use a single fermion toy model to estimate the reflection coefficients for scattering off the phase boundary using a more realistic scalar profile than previous work resulting in a different Kaluza Klein spectrum. The value we calculate for $n_B/s$ is consistent with the mechanism being the source of the baryon asymmetry of our universe provided the $B-L$ violating processes have an efficiency of order $10^{-5}$.

17 pages, 3 figures; References added; Minor changes, Accepted for publication in Phys. Rev. D

References in corpus (8)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Flavor Constraints on Split Fermion Models
• Twisted Split Fermions
• Neutrino Mass Patterns within the See-saw Model from Multi-localization along Extra Dimensions
• Kaluza-Klein Structure Associated With Fat Brane
• Low-energy effective theory from a non-trivial scalar background in extra dimensions
• Split Fermions Baryogenesis from the Kobayashi-Maskawa Phase
• Leptogenesis from Split Fermions