It is logically impossible for an effect to precede its cause. Only acceleration can do that, and due to the equivalence principle, it is the same as the effect of a gravitational field. Time travel entails that certain effects can precede their causes. Light follows a geodesic, and as the elevator accelerates, photons entering perpendicularly to the elevator sidewalls, those photons' path will be curved. More specifically, I want to cut the ground from under an argument which might run thus: My first aim in this paper is to provide a defence of time travel of the second sort. The second sort of defence involves an admission that time travel does indeed involve that which its opponents allege it does involve, e.g., being in more than one place at a time, but arguing that such consequences in no way vitiate the logical consistency of this notion. those consequences which other philosophers allege it does entail. The first sort of defence involves showing that time travel does not entail. Most of the articles that deal with it have been concerned to defend the logical consistency of time travel against those who claim that it entails one or more contradictions.
Researchers confirmed these points at a press conference today at NASA headquarters where they announced the long-awaited results of Gravity Probe B (GP-B).
The presence of mass, energy, and momentum (collectively quantified as mass-energy density or stress-energy) resulted in the bending of this space-time coordinate system. There is a space-time vortex around Earth, and its shape precisely matches the predictions of Einstein's theory of gravity. You call the story of Vulcan a cautionary. Einsteins general relativity depicted the universe as a geometric system of three spatial and one time dimensions. With curved spacetime, Mercury behaves exactly how Einstein’s theory says it should. The subject of time travel has been receiving increasing attention in the recent philosophical literature. Without curved spacetime you need some other mass to pull on it.
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