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Einstein's equation is: $$G_{\alpha\beta} = 8\pi T_{\alpha\beta}$$ In this equation $G_{\alpha\beta}$ describes the curvature of spacetime and $T_{\alpha\beta}$ describes the mass/energy distribution, so the equation relates curvature to mass/energy. Solving this equation is the basic task in general relativity. There are two ways to look at the ...

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Since you don't locally travel faster than light it is hard to call what you are doing FTL if you don't contract on one side and expand on the other. That said, you don't have to contract space in front of you. The Natario drive is claimed to pancake the space in front of you, thus reducing the distance to your destination but without contracting space in ...

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If you don't want to violate causality then you can only have a few types of faster than light travel. One is to not allow it to slow down. Another is to only allow it to go in one direction and hope the universe is infinite. Otherwise it is rather trivial to use regular slower than light motion between some FTL trips to generate a time machine. As for ...

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