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Sorry if this has already been mentioned in this thread, but a good and enjoyable recent book that covers this subject is "Physics of the Impossible; A Scientific Exploration into the World of Phasers, Force Fields, Teleportation and Time Travel"*by Michio Kaku.
Long story short, Kaku's conclusion is that time travel is "something that does not violate the laws of physics, but that might be possible only thousands to millions of years in the future."
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