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  2. Time travel - Wikipedia

    en.wikipedia.org/wiki/Time_travel

    Any theory that would allow backward time travel would introduce potential problems of causality. [38] The classic example of a problem involving causality is the " grandfather paradox ," which postulates travelling to the past and intervening in the conception of one's ancestors (causing the death of an ancestor before conception being ...

  3. Quantum mechanics of time travel - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics_of_time...

    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]

  4. Time travel claims and urban legends - Wikipedia

    en.wikipedia.org/wiki/Time_travel_claims_and...

    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.

  5. Time-traveler UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Time-traveler_UFO_hypothesis

    The time-traveler hypothesis, also known as chrononaut UFO, future humans, extratempestrial model and Terminator theory [1] is the proposal that unidentified flying objects are humans traveling from the future using advanced technology.

  6. Temporal paradox - Wikipedia

    en.wikipedia.org/wiki/Temporal_paradox

    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.

  7. Time travel in fiction - Wikipedia

    en.wikipedia.org/wiki/Time_travel_in_fiction

    Time travel in modern fiction is sometimes achieved by space and time warps, stemming from the scientific theory of general relativity. [9] Stories from antiquity often featured time travel into the future through a time slip brought on by traveling or sleeping, in other cases, time travel into the past through supernatural means, for example brought on by angels or spirits.

  8. Novikov self-consistency principle - Wikipedia

    en.wikipedia.org/wiki/Novikov_self-consistency...

    Outer Wilds (2019): A video game involving time travel which does not follow the principle, causing a game over if the player experiments to test it. All time travel in the Hallmark Channel original series The Way Home follows the Novikov self-consistency principle. Two of the main characters can travel backwards in time by jumping into a pond ...

  9. Chronology protection conjecture - Wikipedia

    en.wikipedia.org/wiki/Chronology_protection...

    The chronology protection conjecture is a hypothesis first proposed by Stephen Hawking that laws of physics beyond those of standard general relativity prevent time travel—even when the latter theory states that it should be possible (such as in scenarios where faster than light travel is allowed).