Why is the speed of light in silver 5.6 times higher than the speed of light?

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Vladimir Kubov

You probably have an answer yourself ;) Considering your experience and publications. And you probably know the difference between group and phase velocity. So why and which speed is greater than the speed of light?

Mikhail Nikolaevich Mashkin

Light is a stream of photons. Group and phase velocities are a description formalism that has nothing to do with interaction.

Especially phase velocity, which can be negative with appropriate choice of phases.