system
Given the following post, respond as if you're commenting on Reddit:
human
How does superluminal (ftl) transmission of information or matter violate causality?

I keep reading in threads that hypothetical FTL propositions (wormholes, warp drives, ect) violate causality, but I haven't found an explanation as to why this is so.
gpt
The exact time difference between two events depends on your frame of reference. Two events that happen far apart in time in one frame can happen very close to each other in another frame. All this is governed by Lorentz transformations. Now if an object travels faster than light in one frame, than the Lorentz transformation shows that the object is traveling backwards in time in other reference frames. If an object (or information) can travel backwards in time, that means that a cause in the future can lead to an effect in the past. Cause and effect are therefore backwards and causality has been broken. Breaking causality leads to all sorts of non-physical paradoxes, and therefore is understood to be impossible. Therefore, traveling at faster the speed of light is impossible.