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