Mass (Positive) bends space-time generating gravity. If Tachyons are supposed to have imaginary mass, what would they do to spacetime (if they do exist).
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$\begingroup$ Part of the answer may be at physics.stackexchange.com/a/18930/31984 : an imaginary mass accelerates toward a real mass, but a real mass accelerates away from an imaginary mass, so they are both accelerated along the axis passing between them. The other part of the question is how something going faster than light can be localized to anywhere at all. $\endgroup$– Blackbody BlacklightCommented Apr 30, 2014 at 2:06
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1$\begingroup$ "Tachyons in General Relativity": arxiv.org/abs/1011.4847 $\endgroup$– Alfred CentauriCommented May 1, 2014 at 2:25
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