General relativity, the theory of gravity developed a century ago by Albert Einstein, shows one potent way to bend and warp spacetime: gravity curves spacetime and slows clocks. In 1949, Einstein's colleague, Kurt Gödel, found it was even possible to do this to allow time travel into the past, which had disturbing implications.
The time travel theory proposed by Prof Ori and his student Dana Levanony in Physical Review shows that the loop would form within an empty, doughnut-shaped region of spacetime enveloped by a sphere of normal matter.
http://www.sciencenews.org/articles/20050716/fob7.asp
http://www.popsci.com/popsci/science/83c4e288d12c6010vgnvcm1000004eecbccdrcrd.html
http://www.livescience.com/strangenews/070820_time_machine.html
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