Leptogenesis from Left-Handed Neutrino Production during Axion Inflation

Peter Adshead, Evangelos I. Sfakianakis

Research output: Contribution to journalArticlepeer-review


We propose that the observed matter-antimatter asymmetry can be naturally produced as a by-product of axion-driven slow-roll inflation by coupling the axion to standard model neutrinos. We assume that grand unified theory scale right-handed neutrinos are responsible for the masses of the standard model neutrinos and that the Higgs field is light during inflation and develops a Hubble-scale root-mean-square value. In this setup, the rolling axion generates a helicity asymmetry in standard model neutrinos. Following inflation, this helicity asymmetry becomes equal to a net lepton number as the Higgs condensate decays and is partially reprocessed by the SU(2)L sphaleron into a net baryon number.

Original languageEnglish (US)
Article number091301
JournalPhysical review letters
Issue number9
StatePublished - Mar 2 2016

ASJC Scopus subject areas

  • General Physics and Astronomy


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