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  2. 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]

  3. Experimental testing of time dilation - Wikipedia

    en.wikipedia.org/wiki/Experimental_testing_of...

    The emergence of the muons is caused by the collision of cosmic rays with the upper atmosphere, after which the muons reach Earth. The probability that muons can reach the Earth depends on their half-life, which itself is modified by the relativistic corrections of two quantities: a) the mean lifetime of muons and b) the length between the upper and lower atmosphere (at Earth's surface).

  4. 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.

  5. Problem of time - Wikipedia

    en.wikipedia.org/wiki/Problem_of_time

    In classical mechanics, a special status is assigned to time in the sense that it is treated as a classical background parameter, external to the system itself.This special role is seen in the standard Copenhagen interpretation of quantum mechanics: all measurements of observables are made at certain instants of time and probabilities are only assigned to such measurements.

  6. Wheeler's delayed-choice experiment - Wikipedia

    en.wikipedia.org/wiki/Wheeler's_delayed-choice...

    Wheeler's cosmic interferometer uses a distant quasar with two paths to equipment on Earth, one direct and one by gravitational lensing. After [2]. In an attempt to avoid destroying normal ideas of cause and effect, some theoreticians [who?] suggested that information about whether there was or was not a second beam-splitter installed could somehow be transmitted from the end point of the ...

  7. List of experiments in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_experiments_in_physics

    Gravitational time dilation: 1977 De Sitter double star experiment: Kenneth Brecher: Negative result de Sitter effect 1980 Aspect's experiment: Alain Aspect: Confirmation Violation of Bell's inequalities: 1981 UA1 and UA2 experiments: CERN: Discovery W and Z bosons: 1992 DØ experiment: CERN: Multiple Top quark: 1998 Delayed-choice quantum ...

  8. Time travel - Wikipedia

    en.wikipedia.org/wiki/Time_travel

    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 ...

  9. The Fabric of the Cosmos - Wikipedia

    en.wikipedia.org/wiki/The_Fabric_of_the_Cosmos

    The Fabric of the Cosmos: Space, Time, and the Texture of Reality (2004) [1] is the second book on theoretical physics, cosmology, and string theory written by Brian Greene, professor and co-director of Columbia's Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP).