A possible topological interpretation of the Barbero-Immirzi parameter

Details A possible topological interpretation of the Barbero-Immirzi parameter A possible topological interpretation of the Barbero-Immirzi parameter

2009-03-12

arxiv.org/abs/0903.2270v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, based on a talk given at the III Stueckelberg workshop on Relativistic Field Theories, July 8-18, 2008, Pescara (Ita

Scientific paper

A possible topological interpretation of the Barbero-Immirzi parameter is proposed. Classically, by generalizing the Holst action to torsional spacetimes, we construct a precise analogy between the Barbero--Immirzi parameter and the $\theta$-angle of Yang-Mills gauge theories, where the role of the Pontryagin class is played by a well known topological term containing the Holst modification, the Nieh--Yan density. Quantum mechanically, the same analogy requires to study the large gauge sector of the theory. In particular, it is argued that the large sector of the gauge group can be correlated with the Nieh-Yan density, while the Barbero-Immirzi parameter plays the role of the free angular parameter of the large gauge transformations.

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