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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]
Time travel is a concept in philosophy and fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time Machine. [1] It is uncertain whether time travel to the past would be physically ...
A bootstrap paradox, also known as an information loop, an information paradox, [6] an ontological paradox, [7] or a "predestination paradox" is a paradox of time travel that occurs when any event, such as an action, information, an object, or a person, ultimately causes itself, as a consequence of either retrocausality or time travel.
Physicists have long known that some solutions to the theory of general relativity contain closed timelike curves—for example the Gödel metric.Novikov discussed the possibility of closed timelike curves (CTCs) in books he wrote in 1975 and 1983, [1] offering the opinion that only self-consistent trips back in time would be permitted. [2]
Soon afterward, the time traveler was identified as professional spammer Robert J. Todino (known as "Robby"). Todino's attempts to travel in time were a serious belief, and while he believed he was "perfectly mentally stable," his father was concerned that those replying to his emails had been preying on Todino's psychological problems.
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]
A must-read for any fans of time travel fiction, The Time Traveler's Almanac is "the largest and most definitive collection of time travel stories ever assembled." In it, editors Ann and Jeff ...
The thermal time hypothesis is a possible solution to the problem of time in classical and quantum theory as has been put forward by Carlo Rovelli and Alain Connes. Physical time flow is modeled as a fundamental property of the theory, a macroscopic feature of thermodynamical origin. [31] [32]