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Time Travel: A New Hypercomputational Paradigm
Selim G. Akl

Assuming that all objections to time travel are set aside, it is shown that a computational system with closed time like curves is a powerful hypercomputational tool. Specifically, such a system allows us to solve four out of five problems recently advanced as counterexamples to the fundamental principle of universality in computation. The fifth counterexample, however, remains unassailable, indicating that universality in computation cannot be achieved, even with the help of such an extraordinary ally as time travel.

Keywords: Evolving computations, hypercomputation, time travel, unconventional computation, universality.

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