Baryogenesis and Degenerate Neutrinos

Abstract

We bring the theoretical issue of whether two important cosmological demands, baryon asymmetry and degenerate neutrinos as hot dark matter, can be compatible in the context of the seesaw mechanism. To realize leptogenesis with almost degenerate Majorana neutrinos without severe fine-tuning of parameters, we propose the hybrid seesaw mechanism with a heavy Higgs triplet and right-handed neutrinos. Constructing a minimal hybrid seesaw model with SO(3) flavor symmetry for the neutrino sector, we show that the mass splittings for the atmospheric and solar neutrino oscillations which are consistent with the requirements for leptogenesis can naturally arise.

13 pages with one figure using axodraw.sty

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Cited by in corpus (20)

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• Theory of Neutrinos: A White Paper
• Type II Leptogenesis and the Neutrino Mass Scale
• Leptogenesis in the Universe
• Leptogenesis: beyond the minimal type I seesaw scenario
• A Minimal Type II Seesaw Model
• Leptogenesis in the Exceptional Supersymmetric Standard Model: flavour dependent lepton asymmetries
• Thermal leptogenesis with triplet Higgs boson and mass varying neutrinos
• Connecting Leptogenesis to CP Violation in Neutrino Mixings in a Tri-bimaximal Mixing model
• Soft Leptogenesis in Higgs Triplet Model
• Leptogenesis, mass hierarchies and low energy parameters
• Flavour-Dependent Type II Leptogenesis
• Non-thermal leptogenesis with almost degenerate superheavy neutrinos
• Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation
• Analysis of Leptogenesis in Supersymmetric Triplet Seesaw Model
• Leptogenesis in Unified Theories with Type II See-Saw
• Supersymmetric Model of Neutrino Mass and Leptogenesis with String-Scale Unification
• Radiatively Generated ${\nu }_e$ Oscillations: General Analysis, Textures and Models
• Protecting the primordial baryon asymmetry in the seesaw model compatible with WMAP and KamLAND