Spontaneous CP Violation, Small Instanton and Invisible Axion

Details Spontaneous CP Violation, Small Instanton and Invisible Axion Spontaneous CP Violation, Small Instanton and Invisible Axion

1992-09-30

arxiv.org/abs/hep-ph/9209295v1

Phys.Rev.D47:2652-2655,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages

Scientific paper

10.1103/PhysRevD.47.R2652

I propose a variant invisible axion model of spontaneous CP violation at the electroweak scale without CP domain wall and `strong CP' problems. Both large size QCD and small size non-QCD instantons break CP and Peccei-Quinn symmetries, and render cosmologically harmful CP domain walls unstable. The decaying epoch depends on size of small instanton effects, and is around 100 eV if the current neutron electric dipole moment bound is maximally saturated. The model satisfies constraints from primordial D and He photo-dissociation and black hole formation, while producing cosmologically interesting size of gravitational waves and galaxy-scale density perturbations.

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