Spontaneous CP Violation at the Electroweak Scale

Details Spontaneous CP Violation at the Electroweak Scale Spontaneous CP Violation at the Electroweak Scale

1992-03-16

arxiv.org/abs/hep-ph/9203212v2

Phys.Rev.Lett.69:1308-1311,1992

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages

Scientific paper

10.1103/PhysRevLett.69.1308

Utilizing results on the cosmology of anomalous discrete symmetries we show that models of spontaneous CP violation can in principle avoid the domain wall problem first pointed out by Zel'dovich, Kobzarev and Okun. A small but nonzero $\theta_{QCD}$ explicitly breaks CP and can lift the degeneracy of the two CP conjugate vacua through nonperturbative effects so that the domain walls become unstable, but survive to cosmologically interesting epochs. We explore the viability of spontaneous CP violation in the context of two Higgs models, and find that the invisible axion solution of the strong CP problem cannot be implemented without further extensions of the Higgs sector.

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