Production of massive fermions at preheating and leptogenesis

Gian Francesco Giudice, Antonio Riotto, Igor Tkachev, Marco Peloso

Research output: Contribution to journalArticlepeer-review

183 Scopus citations


We present a complete computation of the inflaton decay into very massive fermions during preheating, including back-reaction effects. We show that heavy fermions are produced very efficiently up to masses of order 1017-1018 GeV; the accessible mass range is thus even broader than the one for heavy bosons. We apply our findings to the leptogenesis scenario, proposing a new version of it, in which the massive right-handed neutrinos, responsible for the generation of the baryon asymmetry, are produced during preheating. We also discuss other production mechanisms of right-handed neutrinos in the early Universe, identifying the neutrino mass parameters for which the observed baryon asymmetry is reproduced.

Original languageEnglish (US)
Pages (from-to)XXIV-29
JournalJournal of High Energy Physics
Issue number8
StatePublished - 1999


  • Baryogenesis
  • Cosmology of Theories beyond the SM
  • Physics of the Early Universe

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