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Dec 26, 2018 at 23:17 comment added Tobias Diez In this context, it is an arbitrary real-valued function describing the phase of the wave package. The WKB approximation usually yields some kind of equation for it (for the Schrödinger equation it is the Hamilton-Jacobi equation).
Dec 26, 2018 at 21:31 comment added chris Could you please specify what is phi here?
Dec 6, 2013 at 9:58 history answered Tobias Diez CC BY-SA 3.0