Thursday, August 7, 2014

causality - Tachyonic antitelephone vs messaging through a wormhole


From the wikipedia article on tachyons:



Most physicists think that faster-than-light particles cannot exist because they are not consistent with the known laws of physics.[3][5] 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.[5]




Why would one consider hypothetical tachyonic particles impossible because of a causality, while leaving wormholes "sound"? Wouldn't messaging or travelling through a wormhole break causality just as communication using tachyons?


Update - CTC breaks down Really fast.. like Planck constant fast. So is it, that communication using tachyons as a carrier will inevitably violate causality.




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