2 Weeks ago..i was reading the novel "The time Ships"... by Stephen Baxter (the second part of "the time machine" by H.G Wells) in a paragraph the "time traveler" explained how his machine worked.... inducing a "rotation" in the space time so the "time interval" became an "space interval"..of course according to Relativity this is impossible..but why?..in fact let be the metric:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] ds^2 = dx^2 + dy^2 + dz^2 +dT^2 [/tex] (imaginary time ict=T )

But this metric above is just an "Eculidean" 4-dimensional metric...if we have that under no potential or force so the metric element is not altered the metric is just invariant under any rotation (4-dimensional) so you couldn't say exactly what is x and what is t :grumpy: :grumpy:

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# 4-Space time rotations

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