Greetings ! I see that my original thread called "Uncertain Gravity?" did not get the attention that I hoped it would (a level at least sufficient to answer the question I'm now separately posting here). So, the question: What does modern physics say about the double slit experiment where a gravitational wave detector is placed near a slit instead of an EM wave detector (or a nuclear detector since the weak and strong forces have been included in later theories that deal with them based on the quantum approach) ? (And if you don't know that, then - what do you think ?) Thanks ! Live long and prosper.