Video URL

https://pirsa.org/23120046

Continuum Relational Physics in Group Field Theories and Applications to Cosmology

Marchetti, L. (2023). Continuum Relational Physics in Group Field Theories and Applications to Cosmology. Perimeter Institute for Theoretical Physics. https://pirsa.org/23120046

Marchetti, Luca. Continuum Relational Physics in Group Field Theories and Applications to Cosmology. Perimeter Institute for Theoretical Physics, Dec. 14, 2023, https://pirsa.org/23120046 

          @misc{ scivideos_PIRSA:23120046,
            doi = {10.48660/23120046},
            url = {https://pirsa.org/23120046},
            author = {Marchetti, Luca},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Continuum Relational Physics in Group Field Theories and Applications to Cosmology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2023},
            month = {dec},
            note = {PIRSA:23120046 see, \url{https://scivideos.org/pirsa/23120046}}
          }

Luca Marchetti University of New Brunswick

DOI 10.48660/23120046
Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

It is a general expectation in several approaches to quantum gravity that continuum physics emerges as a macroscopic phenomenon from the collective behavior of fundamental quantum gravity degrees of freedom. However, a physical understanding of this emergence process requires us to address deeply intertwined technical and conceptual issues. In this talk, I will focus on two of them: the localization problem, related to the background independence of the underlying quantum gravity theory, and the coarse-graining problem, related to the extraction of the macroscopic, continuum physics from the microscopic, quantum-gravitational one. After discussing what strategies can be adopted in general to address these issues, I will show a concrete implementation of such strategies in the context of the group field theory approach to quantum gravity. I will then demonstrate how these strategies can be employed to extract cosmological physics from group field theories, allowing to clarify the intrinsically quantum-gravitational nature of cosmic structures and to characterize the impact of quantum gravity effects on the emergent cosmological dynamics.

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Zoom link https://pitp.zoom.us/j/99070866809?pwd=Y1VGdGR5clZ0bTFwY2dBRHBwU3ptUT09