No, we didn’t accidentally create a warp bubble
I don't get the excitement for the Alcubierre drive.It requires negative mass, something that doesn't exist.  (It's not like dark matter, something we know exists but don't understand -- it is something that we have no evidence for its existence at all.)I feel like they were just playing with models, entered a nonsensical value (negative value for mass), and discovered a warp drive.  If you're going to do that, just enter negative time and invent time travel while you're at it.