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This question already has an answer here:

Is time travel still considered as a possibility? What does the newer theories like string theory, M theory, etc. say about it.

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marked as duplicate by Qmechanic Mar 7 '13 at 0:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Possible duplicates: physics.stackexchange.com/q/7823/2451 and links therein. $\endgroup$ – Qmechanic Mar 7 '13 at 0:21
  • $\begingroup$ Well, 2 years have passed since that question, something fundamental could theoretically have happened to change the answer :) $\endgroup$ – jwenting Mar 7 '13 at 6:54

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