A Central Limit Theorem for Counting Functions Related to Symplectic Lattices and Bounded Sets

TL;DR

This paper proves a central limit theorem for counting symplectic lattice points in expanding bounded sets, using a novel method and establishing new bounds on a height function in the space of symplectic lattices.

Contribution

It introduces a new approach to establish a CLT for lattice point counts in symplectic lattices and derives new $L^p$ bounds on a height function.

Findings

Proves a CLT for counting functions in symplectic lattices as T approaches infinity.

Establishes new $L^p$ bounds on a height function on the space of symplectic lattices.

Utilizes a tessellation method via a diagonal semigroup in $ ext{Sp}(2d, eals)$.

Abstract

We use a method developed by Bj\"orklund and Gorodnik to show a central limit theorem (as $T$ tends to $\infty$) for the counting functions $\# \left( \Lambda \cap \Omega_T \right)$ where $\Lambda$ ranges over the space $Y_{2d}$ of symplectic lattices in $\mathbb{R}^{2d}$ ($d \geqslant 4$). Here $\lbrace \Omega_T \rbrace_T$ is a certain family of bounded domains in $\mathbb{R}^{2d}$ that can be tessellated by means of the action of a diagonal semigroup contained in $\mathrm{Sp}(2d, \mathbb{R})$. In the process we obtain new $L^p$ bounds on a certain height function on $Y_{2d}$ originally introduced by Schmidt.