Title: Causal Sets, Discrete Gravity

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• Professor Fay Dowker: Imperial College, London.
• Wednesday 20 November 2024, 16:00-17:00
• MR3.

If you have a question about this talk, please contact Amanda Stagg.

I will present the causal set approach to the problem of quantum gravity as the embodiment of a number of unifying hypotheses. Postulating the primacy of spacetime causal order together with discreteness of spacetime unifies the spacetime manifold with its metric. The path integral approach to quantum foundations speaks General Relativity’s language of history and event and unifies quantum and classical dynamics as species of measure theory. On the other hand, Einstein wrote in 1954: “The alternative continuum-discontinuum seems to me to be a real alternative; i.e., there is no compromise” and in giving up on the continuum fundamentally, one may feel in danger of losing known continuum physics altogether. I will alleviate this anxiety by giving examples of the recovery of continuum concepts from causal set theory and set out some challenges for causal set quantum gravity on the immediate horizon.

This talk is part of the Theoretical Physics Colloquium series.

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