Planck-Scale Physics and the Peccei-Quinn Mechanism
arXiv:hep-th/9202003 · doi:10.1016/0370-2693(92)90492-M
Abstract
Global-symmetry violating higher-dimension operators, expected to be induced by Planck-scale physics, in general drastically alter the properties of the axion field associated with the Peccei-Quinn solution to the strong-CP problem, and render this solution unnatural. The particle physics and cosmology associated with other global symmetries can also be significantly changed.
10pp