Kepler Watches White Dwarf Warp Spacetime

It's entirely true that faster than light travel is forbidden by general relativity. However, geometries with closed timelike curves, which can behave very much like time-machines, are not forbidden. It remains to be seen if such curves can be created and controlled. If they can, then a more complete model would be needed to include the effects of such phenomenon. As it stands, such curves could behave in several ways. In one formulation, self consistency would always be required. In another, such curves could be through another dimension, leading to self-inconsistent histories.

Most importantly, closed timelike curves are sufficiently rare that we have not observed natural occurrences. So, although such possibilites are interesting to consider, they are, ultimately, far beyond our current technologies.

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/P6uVgmZA8p0/story01.htm

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