Interacting Quantum Field Theory on a Causal Set

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• Stav Zalel, University of Cambridge
• Friday 28 February 2025, 13:00-14:00
• Potter room/Zoom: https://cam-ac-uk.zoom.us/j/83177386172?pwd=WMMBb4K7LVPuZZZKAWyvDkKoQp711S.1.

If you have a question about this talk, please contact Xi Tong.

Causal set theory is an approach to quantum gravity in which spacetime is fundamentally discrete at the Planck scale. In this theory, spacetime takes the form of a random Lorentzian lattice known as a “causal set”. In this talk, I will describe recent developments in defining interacting scalar quantum field theories on this novel background. I will present diagrammatic rules for computing in-in correlators; these rules are manifestly causal thanks to the appearance of the retarded propagator. This framework is a step towards new quantum gravity phenomenology, since it enables the computation of early universe observables under the assumption that spacetime is fundamentally discrete.

This talk is part of the DAMTP Friday GR Seminar series.

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• Potter room/Zoom: https://cam-ac-uk.zoom.us/j/83177386172?pwd=WMMBb4K7LVPuZZZKAWyvDkKoQp711S.1
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