Planck-scale effects on global symmetries: Cosmology of pseudo-Goldstone bosons


1550-7998=20 We consider a model with a small explicit breaking of a global symmetry, as suggested by gravitational arguments. Our model has one scalar field transforming under a nonanomalous U 1 symmetry, and coupled to matter and to gauge bosons. The spontaneous breaking of the explicitly broken symmetry gives rise to a massive pseudo-Goldstone boson. We… (More)


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