Discrete and continuum third quantization of Gravity

TL;DR

This paper explores the concept of third quantization in gravity through matrix models, group field theory, and a continuum formalism based on loop quantum gravity, aiming to understand the continuum limit of these approaches.

Contribution

It introduces a continuum third quantization formalism for gravity, connecting GFT with loop quantum gravity and analyzing the continuum limit in a rigorous framework.

Findings

Continuum third quantization formalism is developed for Riemannian GR in 3D.

Relations between GFT and continuum third quantization are clarified.

Insights into the continuum limit of GFTs are discussed.

Abstract

We give a brief introduction to matrix models and the group field theory (GFT) formalism as realizations of the idea of a third quantization of gravity, and present in some more detail the idea and basic features of a continuum third quantization formalism in terms of a field theory on the space of connections, building up on the results of loop quantum gravity that allow to make the idea slightly more concrete. We explore to what extent one can rigorously define such a field theory. Concrete examples are given for the simple case of Riemannian GR in 3 spacetime dimensions. We discuss the relation between GFT and this formal continuum third quantized gravity, and what it can teach us about the continuum limit of GFTs.