what is validity of WKB approximation
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The WKB approximation in calculating the asymptotic QNM frequency is always valid for the first and second category and it is always invalid for the third category . ... If we do, then the WKB approximation is invalid.
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The WKB Approximation, named after scientists Wentzel–Kramers–Brillouin, is a method to approximate solutions to a time-independent linear differential equation or in this case, the Schrödinger Equation. Its principal applications are for calculating bound-state energies and tunneling rates through potential barriers.15-Aug-2020
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