[lit-ideas] Re: untestable proposition of the day

  • From: JimKandJulieB@xxxxxxx
  • To: lit-ideas@xxxxxxxxxxxxx
  • Date: Sun, 21 Aug 2005 12:00:39 EDT

Funny, it popped up fine for me....  anyway, here's the article.
<< Scientists Mess with the Speed of Light  
_Ker Than_ 
LiveScience Staff Writer
om) Fri Aug 19, 4:00 PM ET  

Researchers in Switzerland have succeeded in breaking the cosmic speed limit  
by getting light to go faster than, well, light. 
Or is it all an illusion? 
Scientists have recently succeeded in doing all sorts of fancy things with  
light, including slowing it down and even stopping it all together. Now a team  
at the Ecole Polytechnique Fdrale de Lausanne (EPFL) in Switzerland is  
controlling the speed of light using simple off-the-shelf optical fibers,  
the aid of special media such as cold gases or crystalline solids like  in 
other experiments. 
"This has the enormous advantage of being a simple, inexpensive procedure  
that works at any wavelength," said Luc Thvenaz, lead author of the study  
detailing the research. 
Using a technique called Stimulated Brillouin Scattering, the researchers  
were able to slow down or ratchet up the speed of light like the gas pedal on a 
car. They succeeded in reducing the speed of light by almost a factor of 4  
(although that's still plenty fast at 46,500 miles per second), but even more  
dramatically, the team was also able to speed up the speed of light. 
Light in a vacuum travels at approximately 186,000 miles per second, but a  
popular misconception is that, according to Einstein's special theory of  
relativity, nothing in the universe can travel faster than this speed. 
This seeming paradox can be resolved because a pulse of light is actually  
made up of many separate frequency components, each of which moves at their own 
velocities. This is known as the pulse's phase velocity. If all the frequency 
 components have the same phase velocity, then the overall pulse will also 
appear  to move at that velocity.  
However, if the components have different phase velocities, then the pulse's  
overall velocity will depend on the relationships between the velocities of 
the  separate components. If the velocities differ, the pulse is said to be 
moving at  the group velocity. 
By tweaking the relationship between phase velocities, it's possible to  
adjust the group velocity and create the illusion that parts of the pulse are  
traveling faster than the speed of light. 
One area where such an advance could be enormously beneficial is in the  
telecommunications industry. 
Although information can be channeled through fiber optics at the speed of  
light, it can't be processed at this speed because with current technologies,  
light signals must be transformed into much slower electrical signals before  
they are useful.  
Thevenaz's technique would essentially allow light to be processed with light 
 without a costly electrical conversion. 
The group's research will be published in an August 22nd issue of the journal 
 Applied Physics Letters.New Theory: How to Make Objects Invisible Light  
Packets Slow to Jet Speed Blue Skies Only In the Eye of the Beholder Physicists 
Bring Light to a Stop  
Visit LiveScience.com for more daily news, views and scientific inquiry with  
an original, provocative point of view. LiveScience reports amazing, real 
world  breakthroughs, made simple and stimulating for people on the go. Check 
our  collection of Amazing Images, Image Galleries, Interactive Features, 
Trivia and  more. Sign up for our free daily email newsletter today! 

Copyright © 2005 _SPACE.com_ 
SPACE.com/) .>>

========Original  Message========     Subj: [lit-ideas] Re: untestable 
proposition of the day  Date: 8/20/05 6:08:05 P.M. Central Daylight Time  From: 
_mr.eric.yost@xxxxxxxxxx (mailto:mr.eric.yost@xxxxxxxxx)   To: 
_lit-ideas@xxxxxxxxxxxxxx (mailto:lit-ideas@xxxxxxxxxxxxx)   Sent on:    
Well, then, whaddya make of  this?


Yahoo gave me:

Sorry, the page you  requested was not found.

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I didn't get there in  time.

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