Time travel

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No one has turned up from the future and that is still the strongest evidence against visitors Tachyons turn any faster-than-light trip into a trip backwards in time Novikov's self-consistency principle says history simply will not let you break it Morris and Thorne showed in 1988 what a traversable wormhole would require The grandfather paradox appeared in fiction long before physicists took it seriously Hawking's chronology protection conjecture says physics may simply forbid time travel The grandfather paradox and Novikov's self-consistency principle Deutsch's 1991 paper pushes the paradox into another branch of the wavefunction The bootstrap paradox describes an object or an idea that has no origin at all Forward time travel is settled physics and muons already prove it Polchinski's billiard ball returns to knock itself off course and physicists had to answer Back to the Future makes the paradox visible by fading the siblings out of a photograph Godel's 1949 rotating universe contains closed timelike curves

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