New aspects of two-dimensional quantum gravity

Details New aspects of two-dimensional quantum gravity New aspects of two-dimensional quantum gravity

2009-11-21

arxiv.org/abs/0911.4208v1

Acta Phys. Polon. B40:3479, 2009

Physics

High Energy Physics

High Energy Physics - Theory

Lectures presented at the 49th Cracow School of Theoretical Physics, "Non-Perturbative Gravity and Quantum Chromodynamics", Za

Scientific paper

Causal dynamical triangulations (CDT) can be used as a regularization of quantum gravity. In two dimensions the theory can be solved anlytically, even before the cut-off is removed and one can study in detail how to take the continuum limit. We show how the CDT theory is related to Euclidean 2d quantum gravity (Liouville quantum gravity), how it can be generalized and how this generalized CDT model has a string field theory representation as well as a matrix model representationof a new kind, and finally how it examplifies the possibility that time in quantum gravity might be the stochastic time related to the branching of space into baby universes.

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