Energy-momentum operators with eigenfunctions localized along a line

Shaun N. Mosley

The momentum operator $ {\bf p} = - i {\bx \nabla} $ has radial component $\tilde{\mathbf{p}}\equiv -i\hat{\mathbf{r}}(\frac{1}{r}{\partial }_{r}r).$ We show that $\tilde{\mathbf{p}}$ is t…