Theoretical Physics
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Topics 8
Tachyons turn any faster-than-light trip into a trip backwards in time
No one has turned up from the future and that is still the strongest evidence against visitors
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
Hawking's chronology protection conjecture says physics may simply forbid time travel
Deutsch's 1991 paper pushes the paradox into another branch of the wavefunction
Polchinski's billiard ball returns to knock itself off course and physicists had to answer
Godel's 1949 rotating universe contains closed timelike curves
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