PIRSA:22050024

Video URL

https://pirsa.org/22050024

Quantum gravity here and now, and at the end of the world

Magueijo, J. (2022). Quantum gravity here and now, and at the end of the world. Perimeter Institute for Theoretical Physics. https://pirsa.org/22050024

Magueijo, Joao. Quantum gravity here and now, and at the end of the world. Perimeter Institute for Theoretical Physics, May. 02, 2022, https://pirsa.org/22050024 

          @misc{ scivideos_PIRSA:22050024,
            doi = {10.48660/22050024},
            url = {https://pirsa.org/22050024},
            author = {Magueijo, Joao},
            keywords = {Cosmology},
            language = {en},
            title = {Quantum gravity here and now, and at the end of the world},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2022},
            month = {may},
            note = {PIRSA:22050024 see, \url{https://scivideos.org/index.php/pirsa/22050024}}
          }

Joao Magueijo Imperial College London

Talk numberPIRSA:22050024
DOI10.48660/22050024
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

I review a recent approach to connecting quantum gravity and the real world by deconstantizing the constants of nature, and using their conjugate as a time variable. This is nothing but a generalization of unimodular gravity. The wave functions are then packets of plane waves moving in a space that generalizes the Chern-Simons functional. For appropriate states they link up with classical cosmology in the appropriate limit. There are however deviations, namely during the matter to Lambda transition, raising the possibility that quantum gravity could be in action here and now. At the other extreme I show how this approach can be used to resolve the cosmological singularity, and perhaps more.

Zoom Link: https://pitp.zoom.us/j/94010122575?pwd=L291eHNSOG1wZmpCL1lmWHVJaEwwdz09