Nonperturbative sum over topologies in 2 D Lorentzian quantum gravity ∗

@inproceedings{Loll2006NonperturbativeSO,
  title={Nonperturbative sum over topologies in 2 D Lorentzian quantum gravity ∗},
  author={Renate Loll and Willem Westra and Stefan Zohren},
  year={2006}
}
The recent progress in the Causal Dynamical Triangulations (CDT) approach to quantum gravity indicates that gravitation is nonperturbatively renormalizable. We review some of the latest results in 1+1 and 3+1 dimensions with special emphasis on the 1+1 model. In particular we discuss a nonperturbative implementation of the sum over topologies in the gravitational path integral in 1+1 dimensions. The dynamics of this model shows that the presence of infinitesimal wormholes leads to a decrease in… CONTINUE READING