The Ashtekar-Barbero constraints for general relativity with fermions are derived from the Einstein-Cartan canonical theory rescaling the state functional of the gravity-spinor coupled system by the exponential of the Nieh-Yan functional. A one parameter quantization ambiguity naturally appears and can be associated with the Immirzi parameter.
No takes yet. Share an insight, caveat, or question.
Simone Mercuri (2008) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: