Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-11-21
Nucl.Phys.Proc.Suppl. 94 (2001) 96-107
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, 11 figures, uses espcrc2.sty; Lattice 2000 (Plenary)
Scientific paper
10.1016/S0920-5632(01)00957-4
Just as for non-abelian gauge theories at strong coupling, discrete lattice methods are a natural tool in the study of non-perturbative quantum gravity. They have to reflect the fact that the geometric degrees of freedom are dynamical, and that therefore also the lattice theory must be formulated in a background-independent way. After summarizing the status quo of discrete covariant lattice models for four-dimensional quantum gravity, I describe a new class of discrete gravity models whose starting point is a path integral over Lorentzian (rather than Euclidean) space-time geometries. A number of interesting and unexpected results that have been obtained for these dynamically triangulated models in two and three dimensions make discrete Lorentzian gravity a promising candidate for a non-trivial theory of quantum gravity.
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