Warm Inflation, Neutrinos and Dark matter: a minimal extension of the Standard Model

Abstract

We show that warm inflation can be realized within a minimal extension of the Standard Model with three right-handed neutrinos, three complex scalars and a gauged lepton/B-L U(1) symmetry. This simple model can address all the shortcomings of the Standard Model that are not related to fine-tuning, within general relativity, with distinctive experimental signatures that can be probed in the near future. The inflaton field emerges from the collective breaking of the U(1) symmetry, and interacts with two of the right-handed neutrinos, sustaining a high-temperature radiation bath during inflation. The discrete interchange symmetry of the model protects the scalar potential against large thermal corrections and leads to a stable inflaton remnant at late times which can account for dark matter. Consistency of the model and agreement with Cosmic Microwave Background observations naturally yield light neutrino masses below 0.1 eV, while thermal leptogenesis occurs naturally after a smooth exit from inflation into the radiation era.

43 pages (30 main + 13 appendices), 8 figures. Comments are welcome

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• Recent developments in warm inflation
• Gravity Waves and Primordial Black Holes in Scalar Warm Little Inflation
• What is needed of a scalar field if it is to unify inflation and late time acceleration ?
• Viability of warm inflation with standard model interactions
• Dirac-Born-Infeld warm inflation realization in the strong dissipation regime
• Inflaton as a pseudo-Nambu-Goldstone boson
• Supersymmetric $\nu$-Inflaton Dark Matter
• Not So Minimal Warm Inflation