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Tachyon, hypothetical faster-than-light particles.

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kullatiro:
A tachyon /ˈtæki.ɒn/ or tachyonic particle is a hypothetical particle that always moves faster than light. The word comes from the Greek: ταχύς or tachys, meaning "swift, quick, fast, rapid", and was coined by Gerald Feinberg.[1] Most physicists think that faster-than-light particles cannot exist because they are not consistent with the known laws of physics.[2][3] If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special relativity) would lead to violations of causality.[3] Potentially consistent theories that allow faster-than-light particles include those that break Lorentz invariance, the symmetry underlying special relativity, so that the speed of light is not a barrier.

http://en.wikipedia.org/wiki/Tachyon

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