Light stopped in its tracks.
S D Rodrian
jke...@world.std.com (Jeff Kenton) wrote:
> I heard an interview with the experimenters.
> They were much clearer
> about their experiment than the article.
>
> What they did was to stop the beam
>(absorb it in ultra cold atoms) and
> capture the state of the beam (somehow)
> in the atomic spins. A laser
> pulse would then trigger the
> regeneration of an identical beam.
I believe that's what the article said.
> They did not (cannot) slow down
> the photons to zero speed.
No one can do that! The laws of conservation
of energy (and Newton's laws of motions)
could have told you that centuries ago!
What they did, in effect, was to "conserve"
the "motions" of the photon (its energy) IN
your atoms' "spin." (This degrades quickly
but not quickly enough to prevent them from
"reconstituting" the photon (take the photon's
energy/motion(s) from the atoms and
"conserve" it back into the photon again).
In effect, what they proved is that the universe
is made up of a relativistic jumble of motions,
some speeding up while others are slowing down
... and that no motion speeds up without some
other motion/s slowing down & vice versa.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
re:
> = Jeff Kenton
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S D Rodrian
"Robert J. Kolker" <bobk...@usa.net> wrote:
>
> S D Rodrian wrote:
> >
> > In effect, what they proved is that the universe
> > is made up of a relativistic jumble of motions,
> > some speeding up while others are slowing down
> > ... and that no motion speeds up without some
> > other motion/s slowing down & vice versa.
>
> up his spin by drawing in his arms?
> Angular momentum is conserved.
Not quite. Have you ever seen a kid rolling
a hoop down the street by hand-slapping it?
Note that the kid is forced to give the hoop
more than just one single slap (as the hoop's
slap-acquired energy is quickly lost to
friction(s)... and has to be continually re-
energized). Have you noticed that your skater
spins faster for ONLY a very brief time? Well,
there are no perpetual motion systems anywhere
IN the universe... and the reason is that the
only way for one motion to speed up is for
some other motion(s) to slow down as the latter
slowing motion(s) "conserve" their energy in
the former speeding up motion. And the crucial
point here is that the conserved energy/motion
is in eternal commute between those discrete
and individual gravitational systems we know
as "the forms of matter" ... NEVER to make a
permanent home in any single one of them. [See:
The usual Laws of Thermodynamics AND Newton's
gravitational/laws of motion.] If it were otherwise
this wouldn't be a relativistic reality/universe.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
>
> Bob Kolker
Roga
relativistic motions are meaningless and immeasurable -- by any means,
not necessarily human -- due to the quantum cohesion of the condensate.
i.e., the condensate acts like a single quantum particle, with one state
of all conserved quantum quantities, like spin, so the differential
motions of the particles within mean nothing to anything from the
outside.
S D Rodrian
> > some other motion(s) to slow down <bigger snip>
>
> Excuse the severe editing (because it does
> not reflect the overall point
> you were making) but this is not
> accurate... perhaps it's just a 'slip
> of the mind' and perfectly understandable
> but if in a closed system
> something speeds up it could be that
> something sped up in the opposite
> direction by the same amount. Just
> like the skater pulling in his arms,
> one side of his body goes faster in one
> direction and the other goes
> faster in the opposite. That's
> what the conservation of angular
> momentum is all about.
When the skater pulls her arms in
she goes from a slow/large motion to
a smaller/tighter BUT faster motion
(all frictions aside). This, I'm afraid,
is an unbreakable law (of physics) here
IN our universe: All friction(s) aside,
a rolling wheel will NEVER speed up
unless/until some force/person rubs up
(pushes it) against it. And, likewise,
it will NEVER slow down unless/until it
rubs up (it pushes) against something else
... be "that" the ground it's rolling over,
or the atmosphere it's rolling through, or
but only the naked force of gravity. --Newton
"the only way for one motion to speed up is for
some other motion(s) to slow down" (and the
exact opposite truth is just as true). --SDR
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