The spacetime metric in particle QED
  A small time delay between interactions, which has previously been shown to remove divergences from QED, is used to show that, if spacetime geometry is emergent from particle interactions in the manner suggested by Bondi, then Minkowski metric, which appears in the Schroedinger equation as a requirement of the probability interpretation, is perturbed in physical measurement, leading to curved spacetime in accordance with Einstein's equation. 
Charles Francis