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Ok, I’ll bite: how do we manipulate local nonrelativistic spacetime curvature near a spaceship to take advantage of the magnetorestrictive properties of this material? I’ve just finished my last undergrad-equivalent course GR, so voice this in the appropriate math.

throw when heavy, pull when light. its crazy.

https://www.scientificamerican.com/article/the-good-kind-of-...

https://owlcation.com/stem/What-is-the-Mass-Effect-Gravity-A...

You linked to ... woo? Like, this is not even science. I asked for a mathematical explanation of how to utilize the more exotic invariants of momentum in nonrelativistic spacetime, voiced in terms of GR. If the GP is going to claim this drive is possible because momentum isn't conserved in GR, the least they could do is use GR to show what they mean?

It's a low bar, but it's there.

https://en.wikipedia.org/wiki/Mach%27s_principle

Enjoy.

What.

Hmm! I didn't realize that, and I also didn't realize that in a relativistic theory conservation of energy and momentum are the same thing.

(Evidently some dumbfucks are downvoting your comment instead of checking Wikipedia.)