PIRSA:23120042

Video URL

https://pirsa.org/23120042

Effective metrics from group field theory

Mickel, L. (2023). Effective metrics from group field theory. Perimeter Institute for Theoretical Physics. https://pirsa.org/23120042

Mickel, Lisa. Effective metrics from group field theory. Perimeter Institute for Theoretical Physics, Dec. 21, 2023, https://pirsa.org/23120042 

          @misc{ scivideos_PIRSA:23120042,
            doi = {10.48660/23120042},
            url = {https://pirsa.org/23120042},
            author = {Mickel, Lisa},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Effective metrics from group field theory},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2023},
            month = {dec},
            note = {PIRSA:23120042 see, \url{https://scivideos.org/pirsa/23120042}}
          }

Lisa Mickel University of Sheffield

Talk numberPIRSA:23120042
DOI10.48660/23120042
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Group field theory (GFT) is a background independent approach to quantum gravity in which the quanta represent "building blocks of space". It has been successfully applied to the cosmological setting and shown to have the potential for rich phenomenology. In this talk we will explore a novel proposal to construct operators in GFT based on symmetries of the action, which can then be identified with respective classically conserved currents. This construction relies on a relational coordinate system spanned by four massless scalar fields. As the classical currents are related to the components of the metric, the expectation values of the new GFT operators can be interpreted as giving rise to an effective metric originating directly from the quantum theory. We proceed to investigate the implications of this proposition for a flat homogeneous universe and its perturbations.

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Zoom link https://pitp.zoom.us/j/98843634192?pwd=OWs1SEdiWnIyYmlSbTh3bU9MaDBDdz09