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SYGR: Symposium Gravitation – neueste Ergebnisse und Trends

SYGR 1: Symposium Gravitation - neueste Ergebnisse und Trends

SYGR 1.4: Invited Talk

Tuesday, March 20, 2018, 15:30–16:00, Z6 - HS 0.004

From QFT on curved spacetimes to effective quantum gravity — •Kasia Rejzner — University of York, York, United Kingdom

Quantizing gravity is one of the biggest challenges of modern theoretical physics. There are many conceptual problems that one has to address, including the non-locality of observables and the background independence. These issues appear already, if one tries to build effective theory of quantum gravity, treating metric perturbation like a quantum field on a curved background. In this talk, I will explain how these conceptual problems can be address in the modern approach to QFT on curved spacetime, where the central object to study is the algebra of observables of the theory, constructed independently of the choice of a state. I will also show how this approach applies to quantum cosmology.