The Relativity of Curved Space Time

In general relativity, in a curved space time background, you really can't do that. There's no unique way of comparing vectors like spins at different locations in curved space uniquely. But if you give me a certain path between two points in space time, then I can do my best to keep the spins constant as I move along the path. That is called parallel transport,. You can read about it in Volume 1 of the biggest ideas in the universe. And so that is what will happen. Some version of that, depending on what kind of spin you're moving around, will happen as you move a spin without literally pushing its direction of motion. If you just sort of do your best to