Re: Download a new book on quantum mechanics and relativity.

From: Evgenij Barsukov (e-barsoukov2_hate_spam_at_ti.com)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 15:34:01 -0500

Eugene Stefanovich wrote:
>> would confirm FTL (faster than light) signaling. So far there are few
>> experiments
>> (rather controversial) that demonstrated such signaling by using
>> electron tuneling effect which is a QM effect and so hints that
>> there could be something related to your theory. Unfortunately
>> the distances over which such signaling was done were only
>> few angstrems.
>
>
> Could you give me the reference please?

I was refering to experiments by Nimitz, of which you are already
aware.

Superluminal signaling by photonic tunneling
G. Nimtz
IEEE Journal of selected topics in quantum electronics Vol. 9, 79 (2003)
regular paper

On superluminal tunneling
G. Nimtz
Progress in Quantum Electronics, Vol. 27, 417 (2003)
review article

> First, let me make it clear that I am not speaking about superluminal
> propagation of particles. Of course, there is quantum effect (similar
> to tunneling) which permits a quantum wave packet to spread out
> faster than the speed of light (see subsection 7.3.2). This effect was
> thoroughly discussed, e.g., by Hegerfeldt. This effect is tiny for
> massive particles. I can easily believe that such an effect is more
> pronounced
> in the case of photons. It could be that recent experiments on FTL
> propagation of light by Chiao and Nimtz and many others (see
> reference [21] in chapter 12) are
> manifestations of this effect. I didn't give much thought to this idea.
> Although, this is a fascinating and rapidly developing field,
> that's not what I am talking about.

These things can be related, because wherever you have changing
electric fields (which you need to detect the rate of electrostatic
enteraction) you will also have radiation.

At the other hand, effects like this have been traditionaly modeled
using relativistic QM equations like Dirak eqn, so it would be
interesting to apply your new formalism to this cases and see if
it will give different results.

> I am talking about instantaneous propagation of interaction between
> charged particles. There are claims of observation of such an effect
> (see, eg. W.D.Walker in ref [21] in chapter 12) but they do not look
> solid and were not confirmed by others. As I wrote earlier, I have no
> clue about how such an experiment can be performed.
> I am anxious to talk to an experimentalist who is willing to entertain
> this idea and knows about experimental limitations.

One problem I see with any of such experiments would be to exclude radiation,
that is unavoidable with any changes of electrostatic field. Any oscilating
couple of charges has periodicaly changing electrostatic field that radiates.

At the other hand, it causes periodicaly changing electrostatic field and
therefore changing force on a third charged particle that can be
observed by its movements (for example, if we take not a single charged
particles but a couple of charged particles we would cause their oscilation).

   In order to measure the rate of electrostatic interaction you would need
to detect when the test particle (or "receiver" oscilator) starts to oscilate
after the first (leading) couple oscilation onset. It does not seem to be such an
unusual experiment. In fact it appears to me that kinetics of such system
could be described by Maxwells eqns, and signaling between two oscilators
whould be described by radiation mechanism.

  It looks intuitively that to for your test you would nees some change of
coulombic force that would not cause radiation. But I can not think about
any event where this would happen (radiation would have to be prohibited
by differences between states less then h*v?).

   Can you give just one example of such instanteneous signaling event
(even if not experimentaly realizable)? If you can write formalism for it,
then you should be able to give a system, a gedanken experiment to which
this formalism can be applied?

Regards,
Evgenij 

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Relevant Pages

  • Re: Download a new book on quantum mechanics and relativity.
    ... >> would confirm FTL signaling. ... IEEE Journal of selected topics in quantum electronics Vol. 9, ... > propagation of particles. ... particles but a couple of charged particles we would cause their oscilation). ...
    (sci.physics.relativity)
  • Re: Download a new book on quantum mechanics and relativity.
    ... >> would confirm FTL signaling. ... IEEE Journal of selected topics in quantum electronics Vol. 9, ... > propagation of particles. ... particles but a couple of charged particles we would cause their oscilation). ...
    (sci.physics.particle)
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