 Quote by benk99nenm312
√(1- v2/c2) has two solutions, just like every other square root. It would be possible to get a negative solution.
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Yes … so
slower-than-light particles can travel either forward
or backward in time.
But tachyons can't … their time dilation is imaginary (and minus imaginary is still imaginary
)
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As I stated, tachyons have some odd properties. One, they go backwards in time
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No they don't …
If we see a tachyon going
from A
to B, another observer may see it go
from B
to A … that's all!
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Two, they accelerate when they lose energy. How would this exotic property be possible without going backwards in time?
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Nooo … energy = m
0/√(1 - v
2/c
2), so either the energy of tachyons is also imaginary, or their rest-mass is.