Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-11-13
Phys.Rev.D81:125015, 2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
V1: 8 pages, 1 figure. V2: no significant changes, slight change in the title, some references added, version accepted for pub
Scientific paper
By identifying the recently introduced Barbero-Immirzi field with the QCD axion, the strong CP problem can be solved through the Peccei-Quinn mechanism. A specific energy scale for the Peccei-Quinn symmetry breaking is naturally predicted by this model. This provides a complete dynamical setting to evaluate the contribution of such an axion to the cold dark matter content of the Universe. Furthermore, a tight upper bound on the tensor-to-scalar ratio production of primordial gravitational waves can be fixed, representing a strong experimental test for this model.
Lattanzi Massimiliano
Mercuri Simone
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