PIRSA:18110075

Reconstructing the Quantum Gravity Effective Action

Knorr, B. (2018). Reconstructing the Quantum Gravity Effective Action. Perimeter Institute. https://pirsa.org/18110075

Knorr, Benjamin. Reconstructing the Quantum Gravity Effective Action. Perimeter Institute, Nov. 22, 2018, https://pirsa.org/18110075 

          @misc{ pirsa_PIRSA:18110075,
            doi = {10.48660/18110075},
            url = {https://pirsa.org/18110075},
            author = {Knorr, Benjamin},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Reconstructing the Quantum Gravity Effective Action},
            publisher = {Perimeter Institute},
            year = {2018},
            month = {nov},
            note = {PIRSA:18110075 see, \url{https://pirsa.org}}
          }

Benjamin Knorr

Nordic Institute for Theoretical Physics

Talk number
PIRSA:18110075
Collection
Talk Type
Subject
Abstract

I will present a new method to constrain the quantum effective action of gravity, inspired by recent results from causal dynamical triangulations (CDT). After a short introduction to CDT, I will start from a parameterisation of the effective action to calculate correlation functions for observable quantities. Matching these correlators to CDT data allows to reverse-engineer the couplings which describe the effective dynamics. As a concrete example, the autocorrelation of spatial volume fluctuations is considered. The comparison to CDT data suggests the existence of non-local interaction terms, which might have interesting phenomenological consequences for the interpretation of dark energy.