A tachyons are hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light (FTL) particles cannot exist because superluminal transmission of information w...A tachyons are hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light (FTL) particles cannot exist because superluminal transmission of information would violate causality, since it would allow a causal relationship between events that were spacelike in relation to one another, and the timeordering of such events is different according to different observers.
