Warm baryogenesis

Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos, Joao G. Rosa

Research output: Contribution to journalArticlepeer-review


We show that a baryon asymmetry can be generated by dissipative effects during warm inflation via a supersymmetric two-stage mechanism, where the inflaton is coupled to heavy mediator fields that then decay into light species through B- and CP-violating interactions. In contrast with thermal GUT baryogenesis models, the temperature during inflation is always below the heavy mass threshold, simultaneously suppressing thermal and quantum corrections to the inflaton potential and the production of dangerous GUT relics. This naturally gives a small baryon asymmetry close to the observed value, although parametrically larger values may be diluted after inflation along with any gravitino overabundance. Furthermore, this process yields baryon isocurvature perturbations within the range of future experiments, making this an attractive and testable model of GUT baryogenesis.
Original languageEnglish
Pages (from-to)425–429
JournalPhysics Letters B
Issue number4-5
Publication statusPublished - 18 Oct 2011


  • hep-ph
  • astro-ph.CO
  • hep-th
  • Baryogenesis
  • Dissipation
  • Warm inflation
  • Grand Unified theories


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