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Closed timelike curve
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From the point of view of general relativity, a closed timelike curve (CTC) is a closed worldline. If CTCs exist, their existence would seem to imply at least the theoretical possiblity of making a time machine.
If a second time parameter is introduced to discuss a CTC, then the question "Is it possible to travel backwards in time?" becomes meaningful, since at least two different time parameters are used. A simpler question is "Under what circumstances can a CTC exist?"
See also
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details