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The Danish National Research Foundation:
Network in Mathematical Physics and Stochastics

Funded by The Danish National Research Foundation

MPS-RR 2004-6
February 2004

Renormalization of 3D Quantum Gravity from Matrix Models

by: Jan Ambjørn, J. Jurkiewicz , R. Loll


Lorentzian simplicial quantum gravity is a non-perturbatively defined theory of quantum gravity which predicts a positive cosmological constant. Since the approach is based on a sum over space-time histories, it is perturbatively non-renormalizable even in three dimensions. By mapping the three-dimensional theory to a two-matrix model with ABAB interaction we show that both the cosmological and the (perturbatively) nonrenormalizable gravitational coupling constant undergo additive renormalizations consistent with canonical quantization.

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This paper has now been published in Phys. Lett. B 581, 255--262 (2004)