Peccei--Quinn mechanism in gravity and the nature of the Barbero--Immirzi parameter

Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology

Scientific paper

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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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