PIRSA:23020052

Isometric evolution in de Sitter quantum gravity

Cotler, J. (2023). Isometric evolution in de Sitter quantum gravity . Perimeter Institute. https://pirsa.org/23020052

Cotler, Jordan. Isometric evolution in de Sitter quantum gravity . Perimeter Institute, Feb. 16, 2023, https://pirsa.org/23020052 

          @misc{ pirsa_PIRSA:23020052,
            doi = {10.48660/23020052},
            url = {https://pirsa.org/23020052},
            author = {Cotler, Jordan},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Isometric evolution in de Sitter quantum gravity },
            publisher = {Perimeter Institute},
            year = {2023},
            month = {feb},
            note = {PIRSA:23020052 see, \url{https://pirsa.org}}
          }

Jordan Cotler Harvard University

DOI 10.48660/23020052
Collection
Talk Type Scientific Series
Subject

Abstract

Do the postulates of quantum mechanics survive in quantum gravity? The probabilistic interpretation of amplitudes, enforced by the unitarity of time evolution, is not guaranteed within the path integral formulation and has to be checked. Leveraging the gravitational path integral, we find a non-perturbative mechanism whereby a sum over smooth geometries leads to isometric rather than unitary evolution, which we demonstrate in simple models of de Sitter quantum gravity. These models include Jackiw-Teitelboim gravity and a minisuperspace approximation to Einstein gravity with a positive cosmological constant. In these models we find that knowledge of bulk physics, even on arbitrarily large timescales, is insufficient to deduce the de Sitter S-matrix.

Zoom Link: https://pitp.zoom.us/j/99363952517?pwd=bm80NzhTRUtwLzQ0YjNBTkFpWVpOdz09