Planck-Scale Physics and Solutions to the Strong CP Problem without Axion

Details Planck-Scale Physics and Solutions to the Strong CP Problem without Axion Planck-Scale Physics and Solutions to the Strong CP Problem without Axion

1992-12-31

arxiv.org/abs/hep-ph/9212318v2

Phys.Rev.D47:5565-5570,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, LaTex, IC/92/432, UMDHEP 93-105, LMU-16/92 (minor clarifications in the introduction; missing references are added)

Scientific paper

10.1103/PhysRevD.47.5565

We analyse the impact of quantum gravity on the possible solutions to the strong CP problem which utilize the spontaneously broken discrete symmetries, such as parity and time reversal invariance. We find that the stability of the solution under Planck scale effects provides an upper limit on the scale $\Lambda$ of relevant symmetry breaking. This result is model dependent and the bound is most restrictive for the seesaw type models of fermion masses, with $\Lambda < 10^6$ GeV.

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