Talks by Mukund Rangamani

Baby Universes and Worldline Field Theories

Mukund Rangamani Durham University - Department of Mathematical Sciences

The quantum gravity path integral involves a sum over topologies. Superficially, this feature is similar to Feynman diagrams of quantum field theory and the genus expansion of worldsheet string theory. There are however some key differences. While the standard construction leads to the non-abelian algebra of quantum fields, the quantum gravity path integral has been argued to define an abelian algebra associated with partition function type observables.