## Video URL

https://pirsa.org/23020038# Physical Observables in Canonical Quantum Gravity

### APA

Maas, A. (2023). Physical Observables in Canonical Quantum Gravity. Perimeter Institute for Theoretical Physics. https://pirsa.org/23020038

### MLA

Maas, Axel. Physical Observables in Canonical Quantum Gravity. Perimeter Institute for Theoretical Physics, Feb. 09, 2023, https://pirsa.org/23020038

### BibTex

@misc{ scivideos_PIRSA:23020038, doi = {10.48660/23020038}, url = {https://pirsa.org/23020038}, author = {Maas, Axel}, keywords = {Quantum Gravity}, language = {en}, title = {Physical Observables in Canonical Quantum Gravity}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2023}, month = {feb}, note = {PIRSA:23020038 see, \url{https://scivideos.org/pirsa/23020038}} }

Axel Maas University of Graz

**Source Repository**PIRSA

**Collection**

**Talk Type**Scientific Series

## Abstract

Canonical Quantum Gravity can be considered as a gauge theory of translations. Just like in other gauge theories this implies that physical observables need to be gauge-invariant. Hence, quantities like the metric cannot be observables. This poses new challenges, as this requires to rephrase in the quantum theory how to characterize physics. Moreover, such observables are usually composite. To determine them, the Fröhlich-Morchio-Strocchi mechanism from QFT can be borrowed, to have an augmented perturbative approach.

Zoom Link: https://pitp.zoom.us/j/97927004145?pwd=ekFJaUJSc21UUGdkcDZDWCtpSmdIUT09