Re: FTL Travel is Useless even if it existed?

On Aug 13, 4:36 am, Ian Parker <ianpark...@xxxxxxxxx> wrote:
On 13 Aug, 09:57, mike3 <mike4...@xxxxxxxxx> wrote:

On Aug 11, 10:02 am, Ian Parker <ianpark...@xxxxxxxxx> wrote:

On 9 Aug, 08:34, Sam Wormley <sworml...@xxxxxxxxx> wrote:

mike3 wrote:

So does this mean that afaster-than-light(FTL) system need not go
back in time? Would it be possible to have "FTL" travel that does
_not_ go back in time and because of that, does not create paradoxes
plus is also is *useful*? (Because back-in-timeFTLisuselessif you
want to communicate with/travel to places in the present/future and
not the past, paradox considerations aside. See what I'm driving at?)

   Let me ask you this.... if a tachyon moves from point A to
   point B, a finite distance apart, with a velocity of 2c,

   do you not agree that the tachyon is movingFTLand that
   it take a finite anount of time to transverse the distance?

   The concept may challenge some relationships, but why
   would you say it is going back in time, when, clearly
   some time elasped in the "forward" direction.

In the case of Tachyons there are in fact 2 ways to resolve the
paradox

1) They do not interact with anything so no information is conveyed
FTL.

But if information *was* sentFTL(don't bother asking how, this is a
speculative exercise), it would go back in time and breach causality,
right? No way around it.

2) A Feynmann diagram resolves the paradox. If a tachyon is self
consistent no paradox is violated.

But would this also therefore render ituselessfor sending
information
(and so physical objects like starships, as the structure of them is
"information", you know)?

That is indeed the case. If you send information you destroy it. A
very limited link with the future is possible via quantum uncertainty
(I know I saw the paper somewhere I just can't find it again).

http://en.wikipedia.org/wiki/Tachyon

Also expresses a field theoretic view of tachyons. There is one bottom
line and it is this. One cannot fully understand the properties of
normal fields without reference to tachyons. Highly speculative of
course.


Hmm. I read this, and was curious as to why a _forward_-in-time-going
tachyon cannot be used to sent information "into the future". Going
into the future, not the past, would not breach causality.
.

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