The positive radial momentum operator

Details The positive radial momentum operator The positive radial momentum operator

2003-09-24

arxiv.org/abs/math-ph/0309055v1

Physics

Mathematical Physics

5 pages, plainTex

Scientific paper

The Laplacian in spherical coordinates contains the squared radial momentum operator $ p_r^2 = - r^{-1} \partial_r^2 r $ which is Hermitian and positive. However as has been pointed out by various authors the ``radial momentum operator" $ - i r^{-1} \partial_r r $ is not Hermitian. The positive square root operator of $ p_r^2 $ is found and also its inverse. We discuss the relation of these operators with Fourier transforms, the Hilbert transform and fractional integral operators.

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