On the distribution of eigenvalues of Maass forms on certain moonshine groups

Abstract

In this paper we study, both analytically and numerically, questions involving the distribution of eigenvalues of Maass forms on the moonshine groups ${\Gamma }_0(N{)}^{+}$, where $N>1$ is a square-free integer. After we prove that ${\Gamma }_0(N{)}^{+}$ has one cusp, we compute the constant term of the associated non-holomorphic Eisenstein series. We then derive an "average" Weyl's law for the distribution of eigenvalues of Maass forms, from which we prove the "classical" Weyl's law as a special case. The groups corresponding to $N=5$ and $N=6$ have the same signature; however, our analysis shows that, asymptotically, there are infinitely more cusp forms for ${\Gamma }_0(5{)}^{+}$ than for ${\Gamma }_0(6{)}^{+}$. We view this result as being consistent with the Phillips-Sarnak philosophy since we have shown, unconditionally, the existence of two groups which have different Weyl's laws. In addition, we employ Hejhal's algorithm, together with recently developed refinements from [31], and numerically determine the first $3557$ of ${\Gamma }_0(5{)}^{+}$ and the first $12474$ eigenvalues of ${\Gamma }_0(6{)}^{+}$. With this information, we empirically verify some conjectured distributional properties of the eigenvalues.

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References in corpus (1)

• On the distribution of zeros of the derivative of Selberg's zeta function associated to finite volume Riemann surfaces

Cited by in corpus (3)

• Kronecker's limit formula, holomorphic modular functions and $q$-expansions on certain moonshine groups
• Certain aspects of holomorphic function theory on some genus zero arithmetic groups
• Turing's method for the Selberg zeta-function