Particles cannot pass the velocity-barrier represented by the velocity
of light. However, the special theory of relativity permits the
existence of particles that have always moved with a velocity v >c .
Such particles, tachyons, have special properties that have been used
in the experimental searches for them. Is there any observational
evidence for the physical existence of tachyons?
There are also certain theoretical difficulties with the existence of
tachyons I guess. The special theory of relativity, applied to tachyons
leads to the following paradox. Using a tachyon telephone a person, A ,
emits a tachyon to B at a point of time t1. B moves away from A . The
tachyon is reflected by B and reach A before it was emitted. If the
tachyon could carry information it might bring an order to destroy the
tachyon emitter when it arrives back at A. To avoid similar problems in
regards to the energy-exchange between tachyons and ordinary matter, a
reinterpretation principle is introduced for tachyons. For certain
observers a tachyon will move backwards in time, i.e. the observer
finds that the tachyon is received before it was emitted. Special
relativity tells us that such a tachyon is always observed to have
negative energy. According to the reinterpretation principle, the
observer will interpret his observations to mean that a tachyon with
positive energy moves forward in time. Any thoughts on tachyons,
negative energy and moving backwards in time?
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