On relationship between canonical momentum and geometric momentum

Decompositing of $N+1$-dimensional gradient operator in terms of Gaussian normal coordinates $(ξ^{0},ξ^μ)$, ($μ=1,2,3,...,N$) and making the canonical momentum $P_{0}$ along the normal direction $\mathbf{n}$ to be hermitian, we obtain $\mathbf{n}P_{0}=-i\hbar\left( \mathbf{n}\partial _{0}-\mathbf{M}_{0}\right)$ with $\mathbf{M}_{0}$ denoting the mean curvature vector on the surface $ξ^{0}=const.$ The remaining part of the momentum operator lies on the surface, which is identical to the geometric one.

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