Talks by Claus Kiefer

"TIME IN QUANTUM GRAVITY - From the fundamental level to the classical limit"

Claus Kiefer Universität zu Köln
Time cannot be both absolute (as in quantum mechanics) and dynamical (as in general relativity). I present general arguments for the absence of time at the most fundamental level of quantum gravity. I discuss possible concepts that could replace it and present the recovery of standard time as an approximate concept. My discussion is restricted to quantum geometrodynamics, but I argue for the validity of my conclusions beyond that scheme.