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agent00pi:agent00pi: Frederf: nmrsnr: What this article is saying is that the only part of light waves that have to obey the speed of light is the group velocity, because that's what actually carries the information.
You're saying that the real wave is limited to C but can be expressed as Fourier analysis where some of the elements are not limited to C?
Not quite. Without getting into the heavy relativity type stuff, he's saying that individual (frequency) components of a complex waveform don't necessarily have to propagate at the same velocity as the overall waveform. Fourier analysis is just a tool for identifying which frequency components are present.
Phase velocity is a strange concept.
Actually, disregard that. I just repeated you with different phrasing
