VISHν: Flavour-Variant DFSZ Axion Model for Inflation, Neutrino Masses, Dark Matter, and Baryogenesis

Abstract

The standard flavour-blind DFSZ axion model for solving the strong-CP problem has in the past been extended to account for nonzero neutrino masses and baryogenesis-via-leptogenesis through the Type-I seesaw mechanism, in addition to having viable axion dark matter. Constructing a full and viable cosmological history, however, requires dealing with the cosmological domain wall problem posed by standard DFSZ. In this paper, I report on work with A. Sopov where this challenge is addressed through a flavourvariant model called VISHν that removes the domain wall problem and incorporates successful Higgs- Peccei-Quinn scalar inflation. As part of this, we ensure that the required new high-scale physics does not add to the electroweak naturalness problem.

Keywords

• strong CP problem
• axion
• domain wall
• flavour
• inflation
• naturalness