Limit of current understanding. everything at this level is a theory, with math to boot.. most theories say particles have mass and therefore interact via gra

Limit of current understanding. everything at this level is a theory, with math to boot.. most theories say particles have mass and therefore interact via gravity at insanely small levels (which we cannot currently measure), and other fringe theories postulate particles don’t interact via gravity at all... we won’t be able to experiment with these theories until sensor tech / approaches like the OP are refined enough to be in the ballpark of detecting these small levels of interaction.