Wharton: The Case for Classical Spacetime

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It is usually assumed that spacetime must be quantized to make general
relativity (GR) compatible with quantum theory (QT). But a viable alternative is to reformulate QT in terms of beables localized in classical spacetime. Quantum no-go theorems imply such a task is impossible given certain assumptions, but those assumptions are themselves suspect in a (Lagrangian) GR framework where retrocausal influences are allowed by the mathematics. This paper will lay out the case that retrocausal approaches can explain entanglement in terms of spacetime-local beables, allowing QT to be reformulated in classical spacetime. This case is supported by explicit models that yield the same joint probabilities as maximally-entangled states, as in arXiv:1403.2374.

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