An exact formula relating lattice points in symmetric spaces to the automorphic spectrum

TL;DR

This paper derives an exact formula linking lattice point counts in symmetric spaces to the automorphic spectrum, using spectral identities and harmonic analysis techniques.

Contribution

It introduces a novel global automorphic Sobolev theory and connects geometric lattice counts with spectral data in symmetric spaces.

Findings

Derived an explicit formula relating lattice points to automorphic spectrum.

Developed a new automorphic Sobolev theory for spectral analysis.

Established a method to express solutions via harmonic analysis of automorphic forms.

Abstract

We extract an exact formula relating the number of lattice points in an expanding region of a complex semi-simple symmetric space and the automorphic spectrum from a spectral identity, which is obtained by producing two expressions for the automorphic fundamental solution of the invariant differential operator (Delta - lambda_z)^N. On one hand, we form a Poincare series from the solution to the corresponding differential equation on the free space G/K, which is obtained using the harmonic analysis of bi-K-invariant functions. On the other hand, a suitable global automorphic Sobolev theory, developed in this paper, enables us to use the harmonic analysis of automorphic forms to produce a solution in terms of the automorphic spectrum.