New model "permits time travel", but salvation is secured

Found via Slashdot, BBC News reported that time travel is possible if and only if it is "complementary to the present".

The generally used illustration (the grandfather paradox) can be found in the Slashdot article:

In theory, you could go back in time and meet your infant father but you could not kill him.

Alternatively, you could go back in time and see Jesus being crucified, but you could not prevent him from dying. Our salvation is still secure.

Such are the joys of quantum theory.

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