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Hmm.

I’m not convinced anything we know about can do what a warp drive needs: https://kitsunesoftware.wordpress.com/2017/04/20/can-a-casim...

I've sort of assumed that warp-drives == time-travel and are thus the same level of improbability. Is there a consistent universe where we have warp-drives and are NOT able to time-travel?

I Am Not Any Kind Of Physicist, but the way I've always considered it, is that if you can travel from point A to point B in less time than the speed of light permits, then that is essentially the same as traveling back in time.

Well, yea, it literally is traveling back in time in some inertial reference frame. So far as we know, the laws of physics are identical in one frame, it's possible in ours.

well, that’s assuming that you travel via velocity...

obviously we have no idea (afaik) how to travel in any other way, but it’s possible that we might discover some new means of transport

Or more realistically, better sensors.

And improbability drives powered by cheese.

And don't panic.