Tipler Cylinder Thought Experiment: Though never built, Frank Tipler’s 1974 proposal suggests an infinitely long, dense cylinder spinning near light speed could twist spacetime into closed timelike curves, enabling time travel. General relativity equations permit it, but it requires exotic matter and infinite length—physically impossible. Still, it’s a serious theoretical exploration of how massive rotating objects affect time. It demonstrates that Einstein’s laws don’t outright forbid time travel, under extreme conditions. The Tipler Cylinder remains a key concept in theoretical physics, illustrating the boundary between mathematical possibility and physical reality in the quest to understand time’s malleability within the framework of relativity.
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