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Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time J. Richard Gott
Publisher: Houghton Mifflin Harcourt

It is logically impossible for an event to both happen and not happen in the same universe. Classically the two possibilities are independent, but quantum mechanically they affect each other. The two newer time machines, one proposed by Aharonov and the other by Princeton physicist J. Richard Gott, also rely on Einsteinian relativity to provide the necessary distortion of space and time, but both are more accommodating to the physical comfort of . Einstein's relativity theory describes space-time as having four dimensions: three dimensions of space (allowing for width, height, and depth) and one dimension of time. (This is an effect predicted by Einstein's special theory of relativity, which allows time travel into the future). One is that you go back in time and try and change the past, but you can't because what has already happened has In summary, there are only two possibilities for accommodating backward time travel within a viable set of physical laws. Since they're “connected at the same age”, stepping through the B entrance will take you back to the time when the A entrance was 5 years old, which was 4,995 years ago. Wells, science fiction buffs have gone gaga over the idea of traveling through time. Q: Do time and distance exist in a completely empty universe? For a system to go from configuration A to configuration B, it will have to travel a distance through time to allow for change to occur. There appears to be a quantum limit on how fast an object can travel through space-time, regardless of whether we are able to create a bubble in space-time or not… First off, we have no clue Yes, warp drive is science fiction, but it's interesting to investigate this possibility and open up physical scenarios where warp drive might work. Similarly If your grandfather sired a son before the dilation process started then killing him at any point afterwards (which is only possibility as you can't travel back to before this dilation started) is of course no paradox. Unless perhaps if we cool stuff down till it forms a Bose-Einstein condensate.