4 papers
A Regularization of Quantum Gravity
Wolfgang Beirl, Bernd A. Berg
We re-examine results of the Liouville theory and provide arguments that a {\it negative} bare cosmological constant is essential to define two-dimensional quantum gravity. From th…
2D Lorentzian Gravity as 2D Euclidean Gravity with Ising Spins
W. Beirl, D. A. Johnston
We suggest a generalization of the dynamical triangulation approach to quantum gravity with both timelike and spacelike edges, which can serve as a toy model for quantum gravity in…
Nonperturbative Studies of Quantum Gravity
Wolfgang Beirl, Harald Markum, Juergen Riedler
We investigate quantum gravity in the path integral formulation using the Regge calculus. Restricting the quadratic link lengths of the originally triangular lattice the path integ…
On the Measure of Simplicial Quantum Gravity in Four Dimensions
W. Beirl, H. Markum, J. Riedler
We study quantum gravity in the path-integral formulation using the Regge calculus. In spite of the unbounded gravitational action the existence of an entropy-dominated phase is co…