Two Regularized Determinants of Laplacian through Resurgence theory

TL;DR

This paper explores two regularizations of the Laplacian determinant on Riemann manifolds using resurgence theory, providing formulas, applications, and asymptotic analysis of their relationship.

Contribution

It introduces a resurgence-theoretic approach to regularized Laplacian determinants, deriving explicit formulas and analyzing their asymptotic behavior and interrelation.

Findings

Formulas for regularized determinants via Borel-Laplace resummation.

Application to Laplacian determinants on $S^1$ and higher genus surfaces.

Asymptotic behavior of exponential deformation regularization.

Abstract

We study two types of regularizations of the determinant of Laplacian on Riemann manifold from the viewpoint of resurgence theory. One is the formal logarithmic derivative of the determinant, and the other is its exponential deformation. Under appropriate conditions, the close formulas for both regularized determinant are established through Borel-Laplace resummation which takes into account the contribution of the singularities along the analytic continuation of Theta series $\hat{\Theta}_{D_X}$. The series resembles the trace of the heat kernel, but is defined via the spectrum of the square-root of the Laplacian. As applications, we revisit the well known formal logarithmic derivative of determinant on $S^1$ and compact Riemann surface with higher genus ($\geq2$) corresponding to the Poisson summation formula and Selberg trace formula respectively. Furthermore, the 1-Gevrey asymptotic behavior of the exponential deformation regularization at infinity is considered whose coefficients are determined by the trace of the heat kernel. In the end, we establish the relationship between the two regularized determinants. In fact, they have the same derivatives when the deformation parameter tends to $0$ in exponentially deformed regularization.