Averages of determinants of Laplacians over moduli spaces for large genus

Abstract

Let $\mathcal{M}_g$ be the moduli space of hyperbolic surfaces of genus $g$ endowed with the Weil-Petersson metric. We view the regularized determinant $\log \det(Δ_{X})$ of Laplacian as a function on $\mathcal{M}_g$ and show that there exists a universal constant $E>0$ such that as $g\to \infty$, (1) the expected value of $\left|\frac{\log \det(Δ_{X})}{4π(g-1)}-E \right|$ over $\mathcal{M}_g$ has rate of decay $g^{-δ}$ for some uniform constant $δ\in (0,1)$; (2) the expected value of $\left|\frac{\log \det(Δ_{X})}{4π(g-1)}\right|^β$ over $\mathcal{M}_g$ approaches to $E^β$ whenever $β\in [1,2)$.