The concept of closed timelike curves allows for time loops from "summary" of Time Travel in Einstein's Universe by J. Richard Gott
The idea of closed timelike curves may sound like something out of science fiction, but it is a concept that has serious implications in the realm of theoretical physics. Essentially, closed timelike curves are paths in spacetime that loop back on themselves, allowing for the possibility of time loops. In simpler terms, closed timelike curves suggest that it may be possible to travel back in time and revisit a point in the past. This concept challenges our traditional understanding of time as a linear progression from the past to the future. Instead, it suggests that time could be a closed loop, where events can circle back on themselves. One way to visuali...
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