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Causal structure in spin-foams

by Eugenio Bianchi, Pierre Martin-Dussaud

Submission summary

As Contributors: Pierre Martin-Dussaud
Arxiv Link: (pdf)
Date submitted: 2021-09-08 18:53
Submitted by: Martin-Dussaud, Pierre
Submitted to: SciPost Physics
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
  • High-Energy Physics - Theory
  • Quantum Physics
Approach: Theoretical


The metric field of general relativity is almost fully determined by its causal structure. Yet, in spin-foam models for quantum gravity, the role played by the causal structure is still largely unexplored. The goal of this paper is to clarify how causality is encoded in such models. The quest unveils the physical meaning of the orientation of the two-complex and its role as a dynamical variable. We propose a causal version of the EPRL spin-foam model and discuss the role of the causal structure in the reconstruction of a semiclassical spacetime geometry.

Current status:
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Submission 2109.00986v1 on 8 September 2021

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