Re: FTL communication


"Spaceman" <Realspace@xxxxxxxxxxx> wrote in message
news:opadnXLvNpuOGEPeRVn-oQ@xxxxxxxxxxxxxx
> "Randy Poe" <poespam-trap@xxxxxxxxx> wrote in message
> news:1138656113.432876.282120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> |
> | Spaceman wrote:
> | > <snipped from http://en.wikipedia.org/wiki/speed of light >
> | >
> | > It has long been known theoretically that it is possible for the group
> | > velocity of light to exceed c. One recent experiment made the group
> velocity
> | > of laser beams travel for extremely short distances through caesium
> atoms at
> | > 300 times c.
> | >
> | > If such is true,
> | > a group velocity travels 300 times FTL.
> | > It is simple to send info FTL
> | >
> | > simply use 2 setups
> | > 1 turned on only if by land,
> | > 2 turned on if by sea.
> |
> | Nope. The information that it is turned on can't get there any
> | faster than c.
> |
> | There used to be a nice online simulation of the 300c experiment.
> | It showed pretty clearly the difference between phase velocity
> | and group velocity. It let you turn the pulse train on and
> | off. When you first flip the switch, the information travels
> | at c. It is only after that change propagates through the
> | channel that you start seeing pulses "propagating" at
> | 300c.
>
> So,
> basically you are simply saying the group velocity does not arrive before
> the
> phase velocity does.
> Ok i guess.
> I wish I could find that online simulation.
> :)
>
>
>
You can't use the phase velocity of a wave to propagate a signal faster than
the group velocity of the wavetrain. The phase wave is bounded by the group
wave it is trapped inside. If you want to transmit a signal faster than
lightspeed, you must use a carrier that moves naturally faster than light.
There are 'waves' that will fit the bill - probability waves. QM decrees
that the speed of a probability wave is imaginary. This mean time is
imaginary so it in fact doesn't exist for the probability wave - this means
that we will percieve the speed of a probability wave as being infinite.
Read my site for info.

Greysky

www.allocations.cc
Learn how to build a FTL radio.


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