Systolic Inequalities for Compact Quotients of Carnot Groups with Popp's Volume

TL;DR

This paper establishes a systolic inequality for compact quotients of Carnot groups with Popp's volume, linking the systole to the volume with a constant depending on the Lie algebra's grading dimension.

Contribution

It introduces a new systolic inequality for Carnot group quotients, with the constant depending solely on the grading dimension of the Lie algebra.

Findings

Existence of a universal constant C for the inequality

Systole is bounded above by C times volume to the 1/Q power

The constant depends only on the grading dimension of the Lie algebra

Abstract

In this paper, we give a systolic inequality for a quotient space of a Carnot group $\Gamma\backslash G$ with Popp's volume. Namely we show the existence of a positive constant $C$ such that the systole of $\Gamma\backslash G$ is less than ${\rm Cvol}(\Gamma\backslash G)^{\frac{1}{Q}}$, where $Q$ is the Hausdorff dimension. Moreover, the constant depends only on the dimension of the grading of the Lie algebra $\mathfrak{g}=\bigoplus V_i$. To prove this fact, the scalar product on $G$ introduced in the definition of Popp's volume plays a key role.