# Recovering General Relativity from a Planck scale discrete theory of quantum gravity

### APA

Dowker, F. (2022). Recovering General Relativity from a Planck scale discrete theory of quantum gravity. Perimeter Institute. https://pirsa.org/22030027

### MLA

Dowker, Fay. Recovering General Relativity from a Planck scale discrete theory of quantum gravity. Perimeter Institute, Mar. 03, 2022, https://pirsa.org/22030027

### BibTex

@misc{ pirsa_PIRSA:22030027, doi = {10.48660/22030027}, url = {https://pirsa.org/22030027}, author = {Dowker, Fay}, keywords = {Quantum Gravity}, language = {en}, title = {Recovering General Relativity from a Planck scale discrete theory of quantum gravity}, publisher = {Perimeter Institute}, year = {2022}, month = {mar}, note = {PIRSA:22030027 see, \url{https://pirsa.org}} }

**Collection**

**Subject**

I will present an argument that if a theory of quantum gravity is physically discrete at the Planck scale and the theory recovers General Relativity as an approximation, then, at the current stage of our knowledge, causal sets must arise within the theory, even if they are not its basis. I will argue in particular that an apparent alternative to causal sets, viz. a certain sort of discrete Lorentzian simplicial complex, cannot recover General Relativistic spacetimes in the appropriately unique way. For it cannot discriminate between Minkowski spacetime and a spacetime with a certain sort of gravitational wave burst.

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