86 citations · 195 across the 4 of their papers we have counts for
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A possible topological interpretation of the Barbero-Immirzi parameter
Simone Mercuri
A possible topological interpretation of the Barbero-Immirzi parameter is proposed. Classically, by generalizing the Holst action to torsional spacetimes, we construct a precise an…
Barbero-Immirzi field in canonical formalism of pure gravity
Gianluca Calcagni, Simone Mercuri
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 e…
Interaction of the Barbero--Immirzi Field with Matter and Pseudo-Scalar Perturbations
Simone Mercuri, Victor Taveras
In Loop Quantum Gravity the classical point of departure is the Einstein-Hilbert action modified by the addition of the so-called Holst term. Classically, this term does not affect…
Peccei--Quinn mechanism in gravity and the nature of the Barbero--Immirzi parameter
Simone Mercuri
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 o…
Nieh-Yan Invariant and Fermions in Ashtekar-Barbero-Immirzi Formalism
Simone Mercuri
In order to introduce an interaction between gravity and fermions in the Ashtekar-Barbero-Immirzi formalism without affecting classical dynamics a non-minimal term is necessary. Th…