Planck-Scale Effects on Global Symmetries: Cosmology of Pseudo-Goldstone Bosons

Details Planck-Scale Effects on Global Symmetries: Cosmology of Pseudo-Goldstone Bosons Planck-Scale Effects on Global Symmetries: Cosmology of Pseudo-Goldstone Bosons

2004-04-30

arxiv.org/abs/hep-ph/0404289v2

Phys.Rev. D70 (2004) 115009

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 9 figures, Latex file; sections 3 and 4 merged; sections 5 and 6 merged; appendix B removed; to be published in Phys

Scientific paper

10.1103/PhysRevD.70.115009

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 non-anomalous U(1) symmetry, and coupled lo matter and to gauge bosons. The spontaneous breaking of the explicitly broken symmetry gives rise to a massive pseudo-Goldstone boson. We analyze thermal and non-thermal production of this particle in the early universe, and perform a systematic study of astrophysical and cosmological constraints on its properties. We find that for very suppressed explicit breaking the pseudo-Goldstone boson is a cold dark matter candidate.

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