Feynman rules for simplicial gravity Original Research Article

We develop the general formalism for performing perturbative diagrammatic expansions in the lattice theory of quantum gravity. The results help establish a precise correspondence between continuum and lattice quantities, and should be a useful guide for nonperturbative studies of gravity. The Feynman rules for Regge;s simplicial lattice formulation of gravity are then discussed in detail in two dimensions. As an application, the two-dimensional conformal anomaly due to a D-component scalar field is explicitly computed in perturbation theory.