# Quantum Geometry vs. Quantum Gravity

### APA

Dittrich, B. (2020). Quantum Geometry vs. Quantum Gravity. Perimeter Institute. https://pirsa.org/20030114

### MLA

Dittrich, Bianca. Quantum Geometry vs. Quantum Gravity. Perimeter Institute, Mar. 19, 2020, https://pirsa.org/20030114

### BibTex

@misc{ pirsa_PIRSA:20030114, doi = {10.48660/20030114}, url = {https://pirsa.org/20030114}, author = {Dittrich, Bianca}, keywords = {Quantum Gravity}, language = {en}, title = {Quantum Geometry vs. Quantum Gravity}, publisher = {Perimeter Institute}, year = {2020}, month = {mar}, note = {PIRSA:20030114 see, \url{https://pirsa.org}} }

Bianca Dittrich Perimeter Institute for Theoretical Physics

## Abstract

Quantizing 4D geometries leads to discrete area spectra. Such discrete area spectra are also suggested by the holographic principle and entropy counting for black holes.

Starting with this input of a discrete area spectrum I will construct a path integral for quantum gravity and discuss (quantum) corrections to the GR dynamics that are forced by the discrete area spectra. The resulting model can serve as effective model for the spin foam approach and clarifies the dynamical principles and underlying key assumptions for spin foams. The considerations also point towards key phenomenological differences to e.g. the ADM quantization scheme, and thus to a way to falsify the key assumption of discrete area spectra.