At least when you think of objects moving slower than light there can't be reversing of casuality. But relativity allows for that, we just drop the faster than

At least when you think of objects moving slower than light there can't be reversing of casuality. But relativity allows for that, we just drop the faster than light solutions usually as non-physical. Recently there's been an interesting paper about what happens when we don't drop these solutions: https://arxiv.org/abs/1910.02780 https://arxiv.org/abs/1910.02780 Imagine the Andromeda fleet can move faster than light. When you look at it from Earth POV suddenly it manifests near Earth out of nothing. Looks very similar to quantum mechanics indeterminism - if alien general decided to send the fleet it's there, if he didn't - it's not there, and there's no local cause for it appearing suddenly. What the paper above explores is - starting from relativity including faster-than-light objects and trying to prevent paradoxes they derive quantum mechanics.