|MadSci Network: Physics|
I have been reading some papers about quantum tunneling and evanescent modes, in which is pointed out that some signals can travel faster than light. This looks to violate Special Relativity and Relativistic Causality, but in fact, it does not! because of the difference between front, group, and other velocities. So, I'm puzzled. What is that difference?! And How a single photom have different velocities?
Re: Which is the difference between front, group, signal and energy velocities?
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