A solution of the strong CP problem via the Peccei-Quinn mechanism through the Nieh-Yan modified gravity and cosmological implications

Massimiliano Lattanzi and Simone Mercuri
Phys. Rev. D 81, 125015 – Published 23 June 2010

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.

  • Figure
  • Received 4 December 2009

DOI:https://doi.org/10.1103/PhysRevD.81.125015

©2010 American Physical Society

Authors & Affiliations

Massimiliano Lattanzi1,* and Simone Mercuri2,†

  • 1ICRA and Dipartimento di Fisica, Università di Roma “Sapienza,” Piazzale Aldo Moro 2, 00185 Roma, Italy
  • 2Institute for Gravitation and the Cosmos, Pennsylvania State University, 104 Davey Lab, Physics Department, University Park, Pennsylvania 16802, USA

  • *lattanzi@icra.it
  • mercuri@gravity.psu.edu

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Vol. 81, Iss. 12 — 15 June 2010

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