Recognizing that this is the said same working hypothesis of a supposition of a theory, it occurs to me that the "waves" you get out of a jet engine aren't 100% thrust and that there's fierce amounts of acoustic loss, thermal loss and thrust out of alignment with the vector of motion so I presumed that no matter how theoretically perfect your warp ring might be, the mere act of creating a warp ring would likely cause effects to spill over in directions beyond your control. And while I fully understand that I'm effectively asking you to speculate about the thermal efficiency of a perpetual motion machine, presume our hypothetical Alcubierre drive is gonna spill something. What's the most likely thing it's gonna spill? How would we detect it?