A generalization of a result of Minakshisundaram and Pleijel

Minakshisundaram and Pleijel gave an asymptotic formula for the sum of squares of the pointwise values of the eigenfunctions of the Laplace-Beltrami operator on a compact Riemannian manifold, with eigenvalues less than a fixed number.

Zelditch later extended this result by replacing the pointwise values with the Fourier coefficients of a smooth measure supported on a compact submanifold.

Zelditch's result is very general, and his proof relies on the theory of Fourier integral operators.

Here we give a proof based on methods of Riemannian geometry.