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Apr 20, 2018 at 9:26 comment added Tian An Essentially, the $L^2$ spectrum is described by the action of the Laplace operator, and modular forms turn out to be eigenfunctions, if we are looking at the upper half plane $\mathbb H$ modulo some discrete cocompact lattice $\Gamma$. Generalisations of this sort lead to automorphic forms, which decompose the $L^2$ spectrum of some homogeneous space $G/K$, and instead of the Laplacian one considers the right regular representation.
Apr 17, 2018 at 14:19 comment added Nico A Could you expand on "The $L^2$ spectrum of your manifold is built out of modular forms"?
Aug 10, 2015 at 3:45 history answered Tian An CC BY-SA 3.0