Tachyon
A tachyon or tachyonic
particle is a hypothetical particle that
always moves faster than light . Most
physicists think that faster-than-light
particles cannot exist because they are not
consistent with the known laws of physics. If such particles did exist, they could
be used to build a tachyonic anti telephone
and send signals faster than light, which
(according to special relativity ) would lead
to violations of causality.
Scientists believe that with the help of this particle we can send signal in past.
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