Unambiguous spin-gauge formulation of canonical general relativity with conformorphism invariance

TL;DR

This paper introduces a new, unambiguous spin-gauge formulation of canonical general relativity that incorporates conformal invariance, eliminating the Barbero-Immirzi ambiguity and expanding the phase space with real spin connection variables.

Contribution

It develops a parameter-free, conformally invariant spin-gauge formulation of general relativity with an extended phase space and new gravitational constraints.

Findings

The formulation is free from Barbero-Immirzi ambiguity.

It extends phase space to include conformal symmetry.

The theory introduces a new set of real spin connection variables.

Abstract

We present a parameter-free gauge formulation of general relativity in terms of a new set of real spin connection variables. The theory is constructed by extending the phase space of the recently formulated conformal geometrodynamics for canonical gravity to accommodate a spin gauge description. This leads to a further enlarged set of first class gravitational constraints consisting of a reduced Hamiltonian constraint and the canonical generators for spin gauge and conformorphism transformations. Owing to the incorporated conformal symmetry, the new theory is shown to be free from an ambiguity of the Barbero-Immirzi type.