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Warp wrote:
> Darren New <dne### [at] san rr com> wrote:
>>> Because time travel doesn't exist?
>
>> At the quantum level, it most certainly does.
>
> That would create paradoxes.
Incidentally, the fount of all wisdom (google+wikipedia) says you're
mistaken.
http://en.wikipedia.org/wiki/Feinberg_reinterpretation_principle#Modern_interpretation:_Quantum_field_theory_and_causality
"""
Tachyons are prevented from violating causality by the Feinberg
reinterpretation principle[3] which states that a negative-energy
tachyon sent back in time in an attempt to violate causality can always
be reinterpreted as a positive-energy tachyon travelling forward in
time. This is because observers cannot distinguish between the emission
and absorption of tachyons. For a tachyon, there is no distinction
between the processes of emission and absorption, since there always
exists a sub-light velocity reference frame shift that alters the
temporal direction of the tachyon's world-line, which is not true for
bradyons or photons. The attempt to detect a tachyon from the future
(and violate causality) actually creates the same tachyon and sends it
forward in time. (which is causal) A tachyon detector will seem to
register tachyons in every possible detection model; in reality, the
tachyon "detector" is spontaneously emitting tachyons.
"""
As far as the other particles going back in time,
http://en.wikipedia.org/wiki/Retrocausality
seems to have a decent explanation, altho I see that apparently people
have done something along the lines of explaining it otherwise.
--
Darren New / San Diego, CA, USA (PST)
"That's pretty. Where's that?"
"It's the Age of Channelwood."
"We should go there on vacation some time."
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