Warp wrote:
> Darren New <dne### [at] sanrrcom> 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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