PIRSA:21120027

New Perspectives on (Quantum) Gravity

Ciambelli, L. (2021). New Perspectives on (Quantum) Gravity. Perimeter Institute. https://pirsa.org/21120027

Ciambelli, Luca. New Perspectives on (Quantum) Gravity. Perimeter Institute, Dec. 16, 2021, https://pirsa.org/21120027 

          @misc{ pirsa_PIRSA:21120027,
            doi = {10.48660/21120027},
            url = {https://pirsa.org/21120027},
            author = {Ciambelli, Luca},
            keywords = {Quantum Gravity},
            language = {en},
            title = {New Perspectives on (Quantum) Gravity},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {dec},
            note = {PIRSA:21120027 see, \url{https://pirsa.org}}
          }

Luca Ciambelli

Perimeter Institute for Theoretical Physics

Talk number
PIRSA:21120027
Collection
Talk Type
Subject
Abstract

We expect certain universal results in classical gravity to come unaltered from a quantum theory of gravity. In this talk, I will firstly discuss new ideas on this topic, and the latest understanding we have on this, in an accessible way. After that, I will focus on local symmetries in gravity, and obtain the most general off-shell algebra of diffeomorphisms that acts non-trivially at corners, where gauge charges are supported. Noether charges in Einstein gravity are then shown to generate a faithful representation of this algebra. After pausing and reviewing the covariant phase space formulation, explaining the questions and issues our community faced in successfully applying it to gravity, I will show how a careful treatment of embeddings allows us to establish a field space where Noether charges act canonically via Poisson bracket. This solves a longstanding puzzle in this field, opening doors to new promising investigations. I will conclude by mentioning them and commenting on how new proposals might shed light on old unanswered questions in quantum gravity.

Zoom Link: https://pitp.zoom.us/j/96552295909?pwd=cFZwcGxLdWlaWWhRS21RMExUd1RjQT09