Time Machines: [Revised entry by John Earman and Christian Wüthrich on October 7, 2010.
Changes to: Main text, Bibliography, figure1.html, notes.html]
Recent years have seen a growing consensus in the philosophical community that the grandfather paradox and similar logical puzzles do not preclude the possibility of time travel scenarios that utilize spacetimes containing closed timelike curves. At the same time, physicists, who for half a century acknowledged that the general theory of relativity is compatible with such spacetimes, have...
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