PIRSA: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. https://pirsa.org/23120046

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

          @misc{ pirsa_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},
            year = {2023},
            month = {dec},
            note = {PIRSA:23120046 see, \url{https://pirsa.org}}
          }

Luca Marchetti University of New Brunswick

DOI 10.48660/23120046
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