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Tachyons are hypothetical particles with imaginary mass and they thus may move faster than light. However, their existence in a theory, indicates an unstable ground state.

9 votes

How does faster than light travel violate causality?

There is a simple answer; faster than light travel does not violate causality. What faster than light travel does, is contradicts the usual axiomization of relativity; and hence allows you to derive …
Eelco Hoogendoorn's user avatar