Energy travels at group velocity and not phase velocity?

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zebanaqvi
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How to prove that energy travels at group velocity and not phase velocity?
 
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Start here: http://en.wikipedia.org/wiki/Group_velocity

Note that the group velocity is not always the speed for energy transfer!

A general proof is given in this paper: http://journals.aps.org/archive/abstract/10.1103/PhysRev.105.1129
"General Theorems on the Equivalence of Group Velocity and Energy Transport"
 
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