Hamiltonian Analysis of Pre-geometric Gravity

TL;DR

This paper develops the Hamiltonian analysis of pre-geometric gauge theories that can lead to Einstein-Cartan gravity, connecting to canonical GR results and exploring UV completions.

Contribution

It introduces a Hamiltonian framework for pre-geometric gravity theories, recovering GR in the IR and analyzing constraints in the UV.

Findings

Canonical GR results are recovered in the IR limit.

Constraint algebra in the UV limit is studied using Dirac's algorithm.

Possible pathways for UV completion of gravity are discussed.

Abstract

The Einstein-Cartan theory of gravity can arise from a mechanism of spontaneous symmetry breaking within the context of pre-geometric gauge theories. In this work, we develop the Hamiltonian analysis of such theories. By making contact with the ADM formalism, we show that all the results of canonical General Relativity are correctly recovered in the IR limit of the spontaneously broken phase. We then apply Dirac's algorithm to study the algebra of constraints and determine the number of degrees of freedom in the UV limit of the unbroken phase. We also discuss possible pathways toward a UV completion of General Relativity, including a pre-geometric generalisation of the Wheeler-DeWitt equation and an extended BF formulation of the pre-geometric theory.