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It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality. Forward time travel, outside the usual sense of the perception of time, is an extensively observed phenomenon and is well understood within the framework of special relativity and general ...
Time travel is deterministic and locally free, a paper says—resolving an age-old paradox. This follows research observing that the present is not changed by a time-traveling qubit. It’s still ...
The theoretical study of time travel generally follows the laws of general relativity. Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), which are theoretical loops in spacetime that might make it possible to travel through time. [1] [2] [3] [4]
Even without knowing whether time travel to the past is physically possible, it is possible to show using modal logic that changing the past results in a logical contradiction. If it is necessarily true that the past happened in a certain way, then it is false and impossible for the past to have occurred in any other way.
Theoretically, scientists say time travel is possible. The challenging part is recreating time travel in real life.
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The time-traveler hypothesis is considered pseudoscientific. [citation needed] American astrophysicist Neil deGrasse Tyson has referred to the hypothesis as illogic. [48] [49] UFO skeptic Robert Sheaffer criticized Masters' work because it relies on "the belief that time travel is not only possible, but real." [2]
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