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Keller and Nelson have argued that even if past and future objects do not exist, there can still be definite truths about past and future events, and thus it is possible that a future truth about a time traveler deciding to travel back to the present date could explain the time traveler's actual appearance in the present; [88] these views are ...
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.
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]
Theoretically, scientists say time travel is possible. The challenging part is recreating time travel in real life.
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Although traveling back in time is almost-universally considered physically impossible, theoretical research has explored whether it might be possible. [8] It has also been speculated by scientists such as J. Richard Gott, Ronald Mallet [9] and others [10] [11] that humans may someday be able to time travel to the past. [12]
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