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

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

Massimiliano Lattanzi
(
- ICRA, Rome and
- Rome U.
)
,
Simone Mercuri
(
- Penn State U.
)

Nov, 2009

8 pages

Published in:

Phys.Rev.D 81 (2010) 125015

e-Print:

0911.2698 [gr-qc]

DOI:

10.1103/PhysRevD.81.125015

Report number:

IGC-09-11-3

View in:

ADS Abstract Service

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Abstract: (arXiv)

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.

Note:

V1: 8 pages, 1 figure. V2: no significant changes, slight change in the title, some references added, version accepted for publication in PRD

14.80.Va
04.50.Kd
11.30.Er
95.35.+d
strong interaction: CP
gravitational radiation: primordial
gravitation: model
symmetry breaking
Peccei-Quinn
axion

References(39)

Figures(1)

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