Leptogenesis through direct inflaton decay to light particles

Abstract

We present a scenario of nonthermal leptogenesis following supersymmetric hybrid inflation, in the case where inflaton decay to both heavy right handed neutrino and SU(2)_L triplet superfields is kinematically disallowed. Lepton asymmetry is generated through the decay of the inflaton into light particles by the interference of one-loop diagrams with right handed neutrino and SU(2)_L triplet exchange respectively. We require superpotential couplings explicitly violating a U(1) R-symmetry and R-parity. However, the broken R-parity need not have currently observable low-energy signatures. Also, the lightest sparticle can be stable. Some R-parity violating slepton decays may, though, be detectable in the future colliders. We take into account the constraints from neutrino masses and mixing and the preservation of the primordial lepton asymmetry.

11 pages including 3 figures, uses Revtex, minor corrections, references added

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• Reheating in supersymmetric high scale inflation
• Leptogenesis from a sneutrino condensate revisited
• Shift Symmetry and Higgs Inflation in Supergravity with Observable Gravitational Waves
• Leptogenesis as the source of gravitino dark matter and density perturbations
• Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets
• Eliminating the eta-problem in SUGRA Hybrid Inflation with Vector Backreaction
• Particle decay in post inflationary cosmology
• Fermion masses and proton decay in string-inspired SU(4)*SU(2)^2*U(1)_X
• Neutrinos in a left-right model with a horizontal symmetry
• Particle Physics Approach to Dark Matter
• Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis
• Quantum decay in renormalizable field theories: quasiparticle formation, Zeno and anti-Zeno effects