Tipler cylinders might allow for time travel through rotation from "summary" of Time Travel in Einstein's Universe by J. Richard Gott
The concept of Tipler cylinders enabling time travel through rotation is based on the idea that if a cylinder is long and dense enough, it could theoretically create a "closed timelike curve. " This closed timelike curve would allow for time travel because anything moving along it would loop back on itself in time. According to Gott, the rotation of the Tipler cylinder creates a frame-dragging effect, which is a prediction of general relativity. This frame-dragging effect would twist spacetime around the cylinder and potentially create the closed timelike curve necessary for time travel. In this scenario, an object or spacecraft traveling around the Tipler cylinder in a closed timelike curve could theoretically return to an earlier point in time. This is because the ...
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