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But not faster than.Josan said:Aren't photons massless particles? And don't they move AT the speed of light as a result?
JacobEvans said:I've asked my physics teacher, and he said tachyon always move faster than the speed of light but can't go slower.
Indeed tachyons may even exist in a universe of three temporal dimensions and one spatial dimension, tho' anything which moves faster than light will always appear to go backwards in time. They're a tad tricky to pin down, since they disappear before they exist.
Chirios said:Things cannot go faster than the speed of light due to the fact that the closer they approach light speed, the more mass they gain, so could a theoretical massless particle, (call it a Chirion) move faster than the speed of light?
There has been no evidence for or against the existence of tachyons as a literal particle.Zylstra said:is there any evidence for tachyons?
e2iPi said:In the realm of SR, there is the Feinberg principal which, interestingly enough, predicts that any tachyon traveling backwards in time could would be indistinguishable from a tachyon traveling forward in time.
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IrBubble said:If they travel forward in time, don't they defy relativity, since travelling forward in time with superluminal velocity should not be possible? Or is this just a principle to visualize the phenomenon and explain how causality is not broken?
That is probably the most intuitive way to look at the problem.Master_Ghost_Knight said:The ones that look like moving forward will also look to move slower.