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Leptogenesis from left-handed neutrino production during axion inflation · Around

2015

Leptogenesis from left-handed neutrino production during axion inflation

Adshead, Peter, Sfakianakis, Evangelos I.

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We propose that the observed matter-antimatter asymmetry can be naturally produced as a byproduct of axion-driven slow-roll inflation by coupling the axion to standard-model neutrinos.

We assume that GUT 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 vacuum expectation value (VEV).
In this set up, 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 VEV decays and is partially re-processed by the $SU(2)_{L}$ sphaleron into a net baryon number.

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