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Peccei--Quinn mechanism in gravity and the nature of the Barbero--Immirzi parameter
Published 16 Feb 2009 in gr-qc and hep-th | (0902.2764v2)
Abstract: 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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