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Quantum Harmonic Oscillator
It follows from momentum space definition of position operator as , that by using Schrodinger's equation and taking , we get:
\frac 1 {2m} p^2 \psi(p) -\frac 1 2 m \omega^2 \hbar^2\frac{\partial^2 }{\partial p^2}\psi(p) = E \psi(p)\\
\frac 1 2 \frac{1}{m_0} (-i\hbar \nabla_p)^2\psi(p)+\frac 1 2 m_0 \omega^2 p^2 \psi(p)=E\psi(p)
\end{align}
Since momentum basis Schrodinger equation is same as that of position basis Schrodinger equation, the real-valued momentum wavefunction solution is same as momentum wavefunction corresponding to spatial wavefunction up-to an arbitrary phase which can be found to be for energy eigenfunction. Hence the change , , and in any equation expressed in terms of those variables gives another valid equation.
Configuration space
Finding from given curve in configuration space, .