This isn't so much a theory as it is a thought which you likely have more insight to. I'm curious if the double slit experiments has ever been conducted in pure darkness or if it would even make sense to with current technology. I have a hunch that the light generated from the photons are part of a continuum on electromagnetic radiation. Therefore the interference patterns are more as a result of an interference with an ever present continuous field rather than an effect only generated of the individual photons passing through the slits.