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(Gizmodo)   To Infinitely Fast, and beyond   ( divider line
    More: Cool, theory of relativities, refractive indexes, silica, maximum speed, infinity, nanotechnology  
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7116 clicks; posted to Geek » on 08 Nov 2012 at 6:40 AM (5 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2012-11-08 03:33:27 PM  
Phase velocity can exceed c. We've known this for decades. In fact, group velocity can theoretically exceed c, too - if and only if it contains no information. It is the "speed of information" that cannot exceed c.

For a group velocity to exceed c, however, the photons must have be in a continuous and infinite stream... so it remains purely theoretical. The "information" referred to is that the stream cannot contain even one bit of information: it's guaranteed to be all 1's, no 0's.

So, it looks like this lab just figured out a clever way to demonstrate something that's been known since long before I was born.

Get off my E/M field, young'uns.
2012-11-08 06:35:04 PM  

BigBooper: That movie sucked.

But it's got 2 actors from big trouble in little china, and the best bond villain ever! Never saw it tbh, but I'm curious now, so I'm watching it.
2012-11-08 10:59:06 PM  

BarkingUnicorn: Light has two speeds, one of which can be infinite.

Ow, my head...

It actually has many speeds, depending on the wavelength and the medium through which it is traveling.
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