Barbero-Immirzi field in canonical formalism of pure gravity

Details Barbero-Immirzi field in canonical formalism of pure gravity Barbero-Immirzi field in canonical formalism of pure gravity

2009-02-05

arxiv.org/abs/0902.0957v2

Phys.Rev.D79:084004,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages

Scientific paper

10.1103/PhysRevD.79.084004

The Barbero-Immirzi (BI) parameter is promoted to a field and a canonical analysis is performed when it is coupled with a Nieh-Yan topological invariant. It is shown that, in the effective theory, the BI field is a canonical pseudoscalar minimally coupled with gravity. This framework is argued to be more natural than the one of the usual Holst action. Potential consequences in relation with inflation and the quantum theory are briefly discussed.

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