Making time for quantum gravity

• Giulia Maniccia

Due to gravity being a constrained theory, the Universe evolution is plagued by a “freezing” in the canonical quantum formalism, since the Dirac scheme implies no evolution in time. A possible solution is to define a relational time from existing variables to regain standard QFT evolution, and one can even go to the next order with a perturbative expansion, to infer the quantum gravitational corrections to the quantum matter dynamics. I will briefly address how time can be defined using a reference frame fixing (emerging as a fluid) and the emergence of quantum gravity corrections.

Dicussion