Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-02-16
Phys.Rev.Lett.103:081302,2009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Accepted for publication on Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.103.081302
A general argument provides the motivation to consider the Barbero--Immirzi
parameter as a field. The specific form of the geometrical effective action
allows to relate the value of the Barbero--Immirzi parameter to other quantum
ambiguities through the analog of the Peccei--Quinn mechanism.
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