Speed of light broken in group

[fafalone]

According to the latest research published in Applied Physical Letters, MTSU scientists used a setup that cost about $500 to set up a system that brteaks the speed of light (group velocity, not individual particles).

 

Applied Physics Letters, Vol. 81, No. 11, pp. 2127–2129, 9 September 2002 http://ojps.aip.org/journals/doc/APPLAB-ft/vol_81/iss_11/2127_1.html

[blike]

What is the difference between group velocity and individual velocity?

[fafalone]

The signal gets there in a speed greater greater than c (and at a time before it left), but not of the individual particles that make up the message are ever going faster than c. Weird stuff. For more info, search google for 'superluminal propagation'