Quantum-controlled interactions without field degrees of freedom are shown to be unavoidably retrocausal, but the retrocausal contribution scales as L/T for long interaction times, and in current GME proposals it lies far below experimental resolution.
In the context of QFT, it will be convenient to define the retarded and advanced propagators as bi-distributions with kernels given by G(ab) R (x, x′), G(ab) A (x, x′)
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Causality in relativistic quantum interactions without mediators
Quantum-controlled interactions without field degrees of freedom are shown to be unavoidably retrocausal, but the retrocausal contribution scales as L/T for long interaction times, and in current GME proposals it lies far below experimental resolution.