Quantum weirdness — The Aharonov-Bohm gravitational effect has been measured. Particles behave as if something is acting on them, even when nothing is nearby. This effect was demonstrated for electromagnetic fields 40 years ago. Now it has been confirmed to exist for gravity as well.

https://medium.com/@darkenergyarticles/quantum-weirdness-the-aharonov-bohm-gravitational-effect-has-been-measured-b3d383caf051