it seems the answer is that there is stochastic coupling between the quantum degrees of freedom and the classical gravitational field, and so particles don’t end up losing their coherence in double slit experiments, which would blatantly contradict existing observations
Yep, that’s the section I was looking at to get that information. Maybe I phrased it a bit unclearly. The thing that would contradict existing observations is if the interaction were not stochastic. Since it is stochastic in Oppenheim’s theory, the theory allows the interference patterns that we observe, so there’s no contradiction.
Isn’t that what he addresses in this section?
Yep, that’s the section I was looking at to get that information. Maybe I phrased it a bit unclearly. The thing that would contradict existing observations is if the interaction were not stochastic. Since it is stochastic in Oppenheim’s theory, the theory allows the interference patterns that we observe, so there’s no contradiction.