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In 1949 he demonstrated that universes in which time travel into the past is possible were compatible with Einstein's equations. Wait, what?! Anyone have a re

In 1949 he demonstrated that universes in which time travel into the past is possible were compatible with Einstein's equations. Wait, what?! Anyone have a ref? Edit: Thanks to andyjohnson and vbtemp. TIA for others too.

vbtemp 14y ago
Look at http://en.wikipedia.org/wiki/Closed_timelike_curve http://en.wikipedia.org/wiki/Closed_timelike_curve I.e., "Closed timelike curves". I'm not expert in this matter, but it's a conceptual possibility that fits into general relativity.
andyjohnson0 14y ago
He discovered a solution to Einstein's field equations that permits closed timelike curves if the universe is rotating. http://en.wikipedia.org/wiki/Godel_metric http://en.wikipedia.org/wiki/Godel_metric "This solution has many strange properties, discussed below, in particular the existence of closed timelike curves which would allow for a form of time travel in the type of universe described by the solution. Its definition is somewhat artificial (the value of the cosmological constant must be carefully chosen to match the density of the dust grains), but this spacetime is regarded as an important pedagogical example"
deleted 14y ago
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