Abstract
The metric field of general relativity is almost fully determined by its causal structure. Yet, in spin foam models of 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 space–time geometry.
Original language | English (US) |
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Article number | 181 |
Journal | Universe |
Volume | 10 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2024 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy