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Y.Porat
Posted: Tue Jan 02, 2007 7:40 am
Guest
Fred Diether wrote:
Quote:
"Edward Green" <spamspamspam3@netzero.com> wrote in message
news:1167662677.623960.238000@s34g2000cwa.googlegroups.com...

theory
of light.

But what is this mysterious "photon theory" everyone talks about so
confidently. Can nobody tell me? Is that a new name for QED, for
half-baked just-so stories one sometimes hears about "photons", or
something else?

Nothing mysterious at all. Photon theory is simply the gauge boson part
of QED from what I gather.

----------------------------
and i have a much better suggestion for the 'gauge boson' part

it is witches on brooms !!
------------------------
Quote:

The trope here is parallel to the trope about "Lorentz aether theory"
and relativity (the former maps to classical EM in this analogy). It
is conventional to speak of Lorentz aether theory as a discredited
alternative to special relativity, with an either/or quality: it must
be one or the other and Lorentz lost.

I think only the assumption of a prefered absolute frame really lost.
It is no secret that I support a Dirac-like Sea scenario. Only modified
sufficiently so that it could work. It requires a relativistic medium.
----------

every time you recruit the 'relativistic' you are right!!
(it makes it impressive !!.....)
-----------
Quote:

Well, not quite, in my book. Lorentz's work is not completely
adequate, perhaps, but it includes a point of view which, as Bell
might
have said, included ways of thinking which were right now dumped in
the
rubbish heap alongside ways of thinking which were wrong. Similarly,
taking Marty at his word (quantitative explanations of phenonena
purported to be evidence for photons available in classical EM), I
doubt this way of thinking need be regarded as in contest with "photon
theory", but rather may be a reminder that classical theory extends a
little farther than we might believe -- a way of thinking which we
have
been a little too quick to discard.

Perhaps so. For me classical-quantum is a duality. One will not exist
without the other. Does it go all the way down? Me thinks maybe so.

The problem is, as a species, we just are not that bright. It's
amazing between feeding, fighting and reproductive behavior we can
manage any kind of abstract understanding. Oh sure, we're much
smarter
------------------

you forgot the parroting behaviour .....
------------

Quote:
than the dumb apes, but I wouldn't go beating my chest about it.

---------------
well said
it is the only modest expression i hear ed here in this thread !!
---------------
Quote:

Wink Well, we do seem to have the ability to get smarter.

not always ....
especially not by those who know anything for sure and without doubt
!
they are very smart in their own eyes

btw
duality is a human invention
it is not natures invention
ie
nature has no duality it has unequivocal processes and laws
and means not knowing and understanding the phenomenon to
scratch.
-
ps thank God and Google for their wonderful spell checker......
i was looking for it for years..

ATB
Y.Porat
-----------------
Quote:

FrediFizzx

Guest
Posted: Tue Jan 02, 2007 3:51 pm
On Dec 28 2006, 11:46 am, "Timo A. Nieminen" <t...@physics.uq.edu.au>
wrote:
Quote:
b...@eskimo.com wrote:
Regardless of whether QM is entirely wrong, atoms _are_ really _like_ tiny
radio transmitters emitting spherical dipole radiation. See, for example,
the usual derivation of natural line width (eg, Hecht)

Yes, but this fact is not stressed in undergrad texts, and since
physicists were once undergrads, the professional community is the
lesser for it.

The conventional mental image of lasers, of stimulated emission, is of
populations of identical photons rather than a "classical laser"
emitting superposed waves. (Only heretics like Willis Lamb insist on
writing papers about lasers explained purely classically.) Also, most
people act like the collision area of particles is a big mystery (where
particles intercept more light at a resonance frequency,) and the
papers explaining details of how this works *weren't* written in 1880
or 1925, but instead in 1985. From the standpoint of radio circuitry,
the explanation is obvious. Also, nobody discusses the intense
radiation field which must exist in the 200nM nearfield region of
atoms, fields which should produce mechanical forces and have major
consequences for atomic bonding and for biochemistry. Only in the last
couple of years this is being explored by the AFM people, who found a
great mystery: "friction" between surfaces spaced 20nM apart, where the
surfaces contain doping atoms having narrow band absorption lines. If
we all thought of atoms as little antennas or RLC circuits, effects
like these would be predictable, and perhaps would have been researched
before STMs were invented.

Which all leads me to suspect that the next perhaps minor revolution in
physics will involve discarding the particle picture of light at the
atomic scale, and seeing it as identical to radio waves. If the
presence of Willis Lamb papers, as well as the "non-contact friction"
experiments are any guide, this revolution is already happening.


Quote:
Psst! A nice heresy is non-zero photon rest mass.

Ooooo, weird. Einstein spins in his grave (or instead perhaps is
finally vindicated, since he was always suspicious of SR/GR and thought
that it might have flaws nobody could see.) What would it look like
if you had a bottle containing a dense fluid of cold, slow photons?
And does this mean that electrons around atoms are metastable, and
there are infinite numbers of lower energy states?

((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
William J. Beaty Research Engineer
beaty a chem washington edu UW Chem Dept, Bagley Hall RM74
billb a eskimo com Box 351700, Seattle, WA 98195-1700
ph425-222-5066 http://staff.washington.edu/wbeaty/
Guest
Posted: Tue Jan 02, 2007 4:36 pm
On Dec 31 2006, 9:36 am, "Edward Green" <spamspamsp...@netzero.com>
wrote:

Quote:
Has anybody indicated how the ultraviolet catastrophe is to be avoided
with a purely classical field? This has to do with energy density
stored by the field, and not with its interaction with matter.

I was under the impression that the Ultraviolet Castrophe just involved
the EM statistics of arrays of atomic oscillators "heated" to some
finite temperature, and was solved by assuming that the oscillators'
internal energy states could only have quantized values.

This might imply that the EM field must also be quantized ...leading to
double-slit paradox weirdness. But couldn't it also mean that the EM
field is not quantized, and atoms are only allowed to emit or absorb
brief, many-cycle pulses of EM waves? Or would non-quantized EM
bring in some energy-conservation issues? (Like, what happens when we
illuminate a gas with gamma *waves* emitted by a single atom, and find
that more than one atom gets ionized, and their electrons come whizzing
out with immense KE?) It certainly would have conceptual issues, since
photons presumably have single frequencies, yet brief pulses of EM
waves will have finite line width depending on the envelope of the
pulse.

((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
William J. Beaty Research Engineer
beaty a chem washington edu UW Chem Dept, Bagley Hall RM74
billb a eskimo com Box 351700, Seattle, WA 98195-1700
ph425-222-5066 http://staff.washington.edu/wbeaty/
Guest
Posted: Tue Jan 02, 2007 5:25 pm
On Dec 28 2006, 8:36 am, "Edward Green" <spamspamsp...@netzero.com>
wrote:
Quote:
BTW... I don't mean to be overly cantankerous. I'm excited to discover
the "energy sucking antenna": it's features are weird, yet familiar,
and may be relevant to the absorption of radiation by atoms. You may
want to find a nicer name, though. Ugh.

Note that the term "Energy sucking" was coined by Paul and Fischer, the
authors of the 1983 paper "Light Absorption by a dipole." I had
originally been calling it the "Black Hole Antenna effect" after the
1990 and 1992 papers about phenomena associated with active VLF
antennas by Sutton and Spaniol of NASA. But the earlier paper has
priority in choosing the name, besides avoiding conflation with GR and
black hole physics. Tesla has priority over everyone, but didn't
choose any names or discuss the EM principles of his resonant EM
antennas used for wireless power systems.

Or instead we could call it "superregenerative receiver effect," or
"short resonant EM absorber effect" or similar.



Paul and R. Fischer "Light Absorption by a dipole", SOV. PHYS. USP.,
26(10) Oct. 1983 pp 923-926

((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
William J. Beaty Research Engineer
beaty a chem washington edu UW Chem Dept, Bagley Hall RM74
billb a eskimo com Box 351700, Seattle, WA 98195-1700
ph425-222-5066 http://staff.washington.edu/wbeaty/
Autymn D. C.
Posted: Tue Jan 02, 2007 6:07 pm
Guest
Y.Porat wrote:
Quote:
nature has no duality it has unequivocal processes and laws
and means not knowing and understanding the phenomenon to
scratch.

Nature has no laws, only wrays (rules), no constants, only parameters.

Quote:
ps thank God and Google for their wonderful spell checker......
i was looking for it for years..

I killd God. You can't thank it.

-Aut
Edward Green
Posted: Tue Jan 02, 2007 6:59 pm
Guest
Fred Diether wrote:

Quote:
"Edward Green" <spamspamspam3@netzero.com> wrote in message
news:1167662677.623960.238000@s34g2000cwa.googlegroups.com...

<...>

Quote:
But what is this mysterious "photon theory" everyone talks about so
confidently. Can nobody tell me? Is that a new name for QED, for
half-baked just-so stories one sometimes hears about "photons", or
something else?

Nothing mysterious at all. Photon theory is simply the gauge boson part
of QED from what I gather.

In other words, whatever we can glean from QED concerning the behavior
of electromagnetic fields. Not some words someone might say over
experimental observations suggestive of "light having a particle
nature". I wondered if there were something else.

<...>
Guest
Posted: Tue Jan 02, 2007 7:34 pm
Autymn D. C. wrote:
Quote:
Y.Porat wrote:
nature has no duality it has unequivocal processes and laws
and means not knowing and understanding the phenomenon to
scratch.

Nature has no laws, only wrays (rules), no constants, only parameters.

If the fine-structure constant is a parameter, why is it called a
constant?

Quote:
ps thank God and Google for their wonderful spell checker......
i was looking for it for years..

I killd God. You can't thank it.

-Aut
Autymn D. C.
Posted: Tue Jan 02, 2007 7:39 pm
Guest
jmc8197@softhome.net wrote:
Quote:
Autymn D. C. wrote:
Y.Porat wrote:
nature has no duality it has unequivocal processes and laws
and means not knowing and understanding the phenomenon to
scratch.

Nature has no laws, only wrays (rules), no constants, only parameters.

If the fine-structure constant is a parameter, why is it called a
constant?

Scientists are dumb.
Y.Porat
Posted: Wed Jan 03, 2007 8:36 am
Guest
Edward Green wrote:
Quote:
Fred Diether wrote:

"Edward Green" <spamspamspam3@netzero.com> wrote in message
news:1167662677.623960.238000@s34g2000cwa.googlegroups.com...

...

But what is this mysterious "photon theory" everyone talks about so
confidently. Can nobody tell me? Is that a new name for QED, for
half-baked just-so stories one sometimes hears about "photons", or
something else?

Nothing mysterious at all. Photon theory is simply the gauge boson part
of QED from what I gather.

In other words, whatever we can glean from QED concerning the behavior
of electromagnetic fields. Not some words someone might say over
experimental observations suggestive of "light having a particle
nature". I wondered if there were something else.

...>------------------
if i would have to guess

i bet for
a particle (very s,all and basic)
that has some unknown yet properties
th e most important properties are about its way of movement

ATB
Y.Porat
---------------------
Timo A. Nieminen
Posted: Wed Jan 03, 2007 4:04 pm
Guest
On Wed, 2 Jan 2007, Edward Green wrote:

Quote:
Fred Diether wrote:
"Edward Green" <spamspamspam3@netzero.com> wrote:

But what is this mysterious "photon theory" everyone talks about so
confidently. Can nobody tell me? Is that a new name for QED, for
half-baked just-so stories one sometimes hears about "photons", or
something else?

Nothing mysterious at all. Photon theory is simply the gauge boson part
of QED from what I gather.

In other words, whatever we can glean from QED concerning the behavior
of electromagnetic fields. Not some words someone might say over
experimental observations suggestive of "light having a particle
nature". I wondered if there were something else.

Yes, of course there is something else. Unfortunately, most of the
something else is wrong. Stuff that talks about photons as billiard balls
of light, stuff that claim that particular interpretations of QM are
_fact_, and even the original theory that gave us the word "photon" [1].
As your question suggested, "photon theory" is ill-defined, and means just
about everything it might mean.

Q: Is the term "photon theory" used by physicists in recent times?

[1] Lewis, about 1926. Lamb probably cites the paper. From secondary
sources, it seems that Lewis's idea was pretty kooky, but his name for
lightquanta stuck.

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
Timo A. Nieminen
Posted: Wed Jan 03, 2007 4:43 pm
Guest
On Wed, 2 Jan 2007, billb@eskimo.com wrote:

Quote:
On Dec 28 2006, 11:46 am, "Timo A. Nieminen" <t...@physics.uq.edu.au
wrote:
b...@eskimo.com wrote:
Regardless of whether QM is entirely wrong, atoms _are_ really _like_ tiny
radio transmitters emitting spherical dipole radiation. See, for example,
the usual derivation of natural line width (eg, Hecht)

Yes, but this fact is not stressed in undergrad texts, and since
physicists were once undergrads, the professional community is the
lesser for it.

Partly because undergrads meet QM before they do _serious_
electromagnetics courses (which is because serious EM is more
mathematicaly traumatic). At least the first QM courses tend to deal with
the Schroedinger equation. Introductory course that touch on QM are far
worse, tending to imply the billiard ball photon.

Quote:
The conventional mental image of lasers, of stimulated emission, is of
populations of identical photons rather than a "classical laser"
emitting superposed waves.

In QED, one and the same.

Quote:
(Only heretics like Willis Lamb insist on
writing papers about lasers explained purely classically.) Also, most
people act like the collision area of particles is a big mystery (where
particles intercept more light at a resonance frequency,) and the
papers explaining details of how this works *weren't* written in 1880
or 1925, but instead in 1985. From the standpoint of radio circuitry,
the explanation is obvious.

Quantum physics didn't overthrow classical physics, it built on top of it.
Hanbury Brown's book, Boffin, is very much worth reading for an account of
this (as well as being a well-written, informative, etc, book otherwise).
Hanbury Brown started off professionally in wartime radar/radio
navigation/ECM research, and naturally went into radio astronomy after the
war. The "purely classical" radio intensity interferometer was used to
measure the size of radio sources. Light being EM waves, if it works for
RF, it'll work in the visible, so they (Hanbury Brown and Twiss) did the
theory and proof-of-principle experiment for visible light. The billiard
ball photon school hit the roof! Read the book for the gory details!

But actually reading (eg, Cohen-Tannoudji's book) about what photons do
should have led them to expect it to work. Sometimes conceptual
simplifications (ie "particle") can really hurt!

Quote:
Also, nobody discusses the intense
radiation field which must exist in the 200nM nearfield region of
atoms, fields which should produce mechanical forces and have major
consequences for atomic bonding and for biochemistry. Only in the last
couple of years this is being explored by the AFM people, who found a
great mystery: "friction" between surfaces spaced 20nM apart, where the
surfaces contain doping atoms having narrow band absorption lines. If
we all thought of atoms as little antennas or RLC circuits, effects
like these would be predictable, and perhaps would have been researched
before STMs were invented.

There's difficulty in getting serious funding for research that is well
beyond experimental reach. The nanotechnology is recent, so the rest of
the research is recent. That kind of stuff - modelling real systems,
rather than horribly "idealised" systems - also tend to require serious
computational power, also a recent development.

Modelling atoms as little antennas predates QM. It was too difficult to
do the computation. That's one reason why QM did so well; it was a huge
mathematical simplification. A classical antenna atom is a collection of
simple harmonic oscillators, with a fudge factor f thrown in for each
oscillator. A QM atom is a bunch of energy levels. Number of energy levels
is much less than the number of oscillators (disregarding the fact that
both are actually infinite Smile.

Quote:
Which all leads me to suspect that the next perhaps minor revolution in
physics will involve discarding the particle picture of light at the
atomic scale, and seeing it as identical to radio waves. If the
presence of Willis Lamb papers, as well as the "non-contact friction"
experiments are any guide, this revolution is already happening.

This already happened with QED. Alas, QED in its full glory is hard,
combining classical electrodynamics with quantisation. What a lot of
(most?) students get is a bastardised version that sweeps almost all of
the maths under the rug with the help of bra-ket notation and sticking to
simple 1D plane wave mode cases.

The classical approximation to QED - classical electrodynamics - is very
useful. To be able to apply it to a bunch of (non-periodically arranged)
atoms is revolutionary, driven by growth of computational power.

I see it more as a computational revolution, rather than a theoretical
revolution. The "true" QM/quantum optics people aren't involved in this -
they have their own quantum information/communication revolution. As you
say above, it's in solid state/condensed matter physics where it's
happening.

Quote:
Psst! A nice heresy is non-zero photon rest mass.

Ooooo, weird. Einstein spins in his grave (or instead perhaps is
finally vindicated, since he was always suspicious of SR/GR and thought
that it might have flaws nobody could see.)

Well, Maxwell spins in his grave. The cute thing is that we already have
the theory for finite-mass photons.

A nice review of the state-of-the-art is:
Tu et al, 2005 Rep. Prog. Phys. 68 77-130.

Quote:
What would it look like
if you had a bottle containing a dense fluid of cold, slow photons?
And does this mean that electrons around atoms are metastable, and
there are infinite numbers of lower energy states?

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
Timo A. Nieminen
Posted: Wed Jan 03, 2007 4:47 pm
Guest
On Sat, 29 Dec 2006, Edward Green wrote:

Quote:
Timo A. Nieminen wrote:

Psst! A nice heresy is non-zero photon rest mass.

Why would one think that?

It's nice because we know how to deal with consequences already! Yes, the
upper limit on the photon mass is tiny, but that doesn't exclude the
possibility. It's heretical, and (unless you _insist_ that the rest mass
of photons is greater than the experimental upper limit) not even kooky!
Why _should_ photons be special; why shouldn't hey have rest mass like
most particles?

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
Autymn D. C.
Posted: Wed Jan 03, 2007 9:19 pm
Guest
Timo A. Nieminen wrote:
Quote:
A nice review of the state-of-the-art is:
Tu et al, 2005 Rep. Prog. Phys. 68 77-130.

no còlòn!
harry
Posted: Thu Jan 04, 2007 10:58 am
Guest
"Edward Green" <spamspamspam3@netzero.com> wrote in message
news:1167248188.860988.56560@73g2000cwn.googlegroups.com...
Quote:

harry wrote:

Different people mean different things with "photon". Typically, it means
"particle" in the USA but "wave packet" in Holland.
Similarly in France I know peope who are working on "photons and
phonons",
and probably they don't claim that phonons are particles.

Neat. I had forgotton about that. How far does the parallelism go?
If phonons are quantized modes of the vibrations of solids via a
precisely similar development which leads to photons being quantized
modes of the electromagnetic field, we should perhaps look for "quantum
spookiness" in the behavior of sparse sound, and either find it just as
spooky as single photon interference experiments, or else notice just
why exactly we don't find it spooky.

That's a neat idea too! I had not thought about that. According to
http://en.wikipedia.org/wiki/Phonon the parallelism goes quite far, and
phonons can even be polarised. So, who knows!

Harald
harry
Posted: Thu Jan 04, 2007 11:17 am
Guest
<billb@eskimo.com> wrote in message
news:1167164135.154547.185110@n51g2000cwc.googlegroups.com...
Quote:

harry wrote:

Sorry but.. if you were right then you could file for a fantastic patent
that tells all the radio engineers in the world how to get rid of their
annoying antennas

Lol. You're wrong, he's right, and engineers have known about this
effect for over a century, since the original radio experiments around
1895. It's public domain: unpatentable.

Sorry for the late reply and thanks for the precisions. However, I don't buy
it, or at least, not in full (see further). And anyways it's very
intriguing, even if it's only half-true, I must admit!

Quote:
Go look at antenna textbooks, in their section explaining the origin of
EA or "effective area" of short antennas. (Ask yourself this: how
large is the EM shadow being cast by an antenna where the antenna
length << wavelength?)

Go look at the recent "towerless" AM radio stations which use a high
power resonator in place of a hundred meter vertical tower.

Interesting! I had not noticed them, AM is almost dead in Europe.

Quote:
Go learn how those resonator-powered RF tags work. By tuning its
receiver coil to resonance with the transmitter, a very tiny RF tag can
intercept far more transmitted energy than it could if it's coil was
treated as an untuned, non-resonant transformer secondary.

Or go look at any simple AM pocket radio. Notice that the required
250-meter halfwave antenna is missing? It's inside the radio, in the
form of a ferrite-core coil. That's no simple transformer coil either,
not a "magnetic pickup;" instead it's part of a high-Q resonator being
tuned by the multi-section tuning cap.

Sure, I built some myself as kid. But you claim (or suggest) that adding an
antenna doesn't help. My experience (as well as that of the amateur books)
is different! Moreover, why do I still need to use the headphone cable of my
handy-FM radio as antenna? Me thinks that the truth is somewhere in-between.

Quote:
As part of a resonator, the
antenna-coil creates a large current which is in sync with incoming EM
waves, and so produces a volume-filling "scattered wave." The
scattered wave creates a large interference pattern surrounding the
tiny radio, and this pattern creates a downstream EM shadow
approximately a half-wavelength in diameter. That shadow is WAY larger
than the radio itself. That shadow represents the significant energy
being absorbed by the antenna: it's the "effective area" of the tiny
antenna.

It's a long, long time ago that I learned about this stuff, and then it was
presented in a different way. I also note that the arguments are void of
equations. Anyways, even if you and Jewish cowboy are partly wrong, it's a
very interesting discussion topic; and antenna talk may provide an
alternative lead to understanding QM.

Cheers,
Harald
 
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