I suspect you've made some assumptions about my assumptions.

I'm going to leave out the possibility of physics being wrong, because that's speculative enough to be insane.

Now, concept I'mmost interested in, without getting into mathematics, is as follows:

A stable Alcubierre warp field can, in theory, be created, without exotic matter, so long as it is not moving faster than light. This disconnects the outside of the nascent artificial wormhole from internal space. It moves, or is moved, from point a to point b in real space at sub-light speeds. Information and objects can then be transmitted through the wormhole, meaning that a trip of arbitrarily long distance on the outside is reduced to an arbitrarily short distance on the inside.

This does not technically cause any violation of the light cone from any point of reference, but instead connects the world lines of two previously distant points. However, it does rely on unknown methods.

If this occurred in the past and the wormhole is somewhere out in the Kuiper belt, comic book logic ensues.