A solution of the strong CP problem via the Peccei-Quinn mechanism through the Nieh-Yan modified gravity and cosmological implications
arXiv:0911.2698 · doi:10.1103/PhysRevD.81.125015
Abstract
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.
V1: 8 pages, 1 figure. V2: no significant changes, slight change in the title, some references added, version accepted for publication in PRD
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- Asymptotically AdS black hole with a conformally-coupled scalar field in the first-order formalism of gravity
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- Chern-Simons Extension of ESK Theory