Sneutrino Hybrid Inflation and Nonthermal Leptogenesis

Abstract

In sneutrino hybrid inflation the superpartner of one of the right-handed neutrinos involved in the seesaw mechanism plays the role of the inflaton field. It obtains its large mass after the "waterfall" phase transition which ends hybrid inflation. After this phase transition the oscillations of the sneutrino inflaton field may dominate the universe and efficiently produce the baryon asymmetry of the universe via nonthermal leptogenesis. We investigate the conditions under which inflation, with primordial perturbations in accordance with the latest WMAP results, as well as successful nonthermal leptogenesis can be realized simultaneously within the sneutrino hybrid inflation scenario. We point out which requirements successful inflation and leptogenesis impose on the seesaw parameters, i.e. on the Yukawa couplings and the mass of the right-handed (s)neutrino, and derive the predictions for the CMB observables in terms of the right-handed (s)neutrino mass and the other relevant model parameters.

arXiv comment27 pages, 4 figures; minor changes; version published in JCAP

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• Constraining $\mathcal{N}=1$ supergravity inflationary framework with non-minimal Kähler operators
• Entropy, Baryon Asymmetry and Dark Matter from Heavy Neutrino Decays
• Sneutrino Tribrid Inflation, Metastable Cosmic Strings and Gravitational Waves
• Matter inflation with A_4 flavour symmetry breaking
• Kähler-driven Tribrid Inflation
• Flipped GUT Inflation
• Hilltop inflation with preinflation from coupling to matter fields
• Sneutrino driven GUT Inflation in Supergravity
• Non-thermal Leptogenesis after Majoron Hilltop Inflation
• Pseudosmooth Tribrid Inflation
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• No-scale hybrid inflation with R-symmetry breaking
• Hilltop Supernatural Inflation and SUSY Unified Models
• No-scale SUGRA Inflation and Type-I seesaw
• Non-thermal Gravitino Production in Tribrid Inflation
• Supersymmetric Majoron Inflation
• Leptogenesis: Theory and Neutrino Masses
• Realising effective theories of tribrid inflation: Are there effects from messenger fields?
• No-scale gauge non-singlet inflation inducing TeV scale inverse seesaw mechanism