Discrete and continuum third quantization of Gravity

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.

21 pages, 5 eps figures; submitted as a contribution to the proceedings of the conference "Quantum Field Theory and Gravity Conference Regensburg 2010" (28 September - 1 October 2010, Regensburg/Bavaria); v2: preprint number included

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Cited by in corpus (7)

• Introduction to Loop Quantum Cosmology
• Tensorial methods and renormalization in Group Field Theories
• Effective Hamiltonian Constraint from Group Field Theory
• Quantum fluctuations in the effective relational GFT cosmology
• Perturbing a quantum gravity condensate
• The interacting multiverse and its effect on the cosmic microwave background
• The Space of Connections as the Arena for (Quantum) Gravity