Protecting the Baryon Asymmetry in Theories with R-parity Violation

Abstract

We propose a mechanism for hiding the primordial baryon asymmetry from interactions that could wash it out. It requires the introduction of a baryon number carrying singlet which is in equilibrium in the early universe and shares any existing baryon asymmetry. It decouples from the Standard Model particles before all the interactions required to wash out the asymmetry are in equilibrium ($T\simeq 10$ TeV), and decays after the electroweak phase transition, but before nucleosynthesis. This mechanism can conserve a baryon asymmetry in models (a) with $B-L=0$, such as many $SU(5)$ GUTs, or (b) with $B-L$ violating interactions in thermal equilibrium, such as SUSY with broken $R$-parity. As a result, cosmological constraints on $R$-parity violating operators are relaxed considerably.

12 pages, 2 PS-fig, Latex

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Cited by in corpus (10)

• R-parity violating supersymmetry
• The baryogenesis window in the MSSM
• Baryogenesis for WIMPs
• A Review of WIMP Baryogenesis Mechanisms
• Flavour-Dependent and Basis Independent Measures of R Violation
• Baryonecrosis: Displaced Vertices from $R$-Parity Violation
• Leptogenesis as an origin of dark matter and baryon asymmetries in the E6 inspired SUSY models
• E6 inspired SUSY models with Custodial Symmetry
• Models of Neutrino Masses and Baryogenesis
• A New Mechanism For Baryogenesis Living Through Electroweak Era