On Spielman's Laplacian Eigenratio Conjecture and Related Problems

TL;DR

This paper investigates Spielman's Laplacian eigenratio conjecture, revealing it fails for some graphs but holds for others, including all regular graphs, and derives new bounds and implications for Ramanujan graphs.

Contribution

It provides counterexamples to the conjecture for certain degrees, proves it for degrees up to 2 and for regular graphs, and strengthens results on eigenvalues of Ramanujan graphs.

Findings

Conjecture fails for infinitely many degrees greater than 2.

Conjecture holds for degrees less than or equal to 2.

Regular graphs satisfy stronger eigenvalue bounds.

Abstract

Let $G$ be an $n$-vertex graph with Laplacian eigenvalues $0=\lambda_1(G)\le \lambda_2(G)\le\cdots\le \lambda_n(G)$. Motivated by the Alon-Boppana bound and the Ramanujan phenomenon for regular graphs, Spielman conjectured that, for every graph $G$ with fixed average degree $d\ge 1$, its Laplacian eigenratio satisfies $$ \frac{\lambda_2(G)}{\lambda_n(G)} \le \frac{d-2\sqrt{d-1}}{d+2\sqrt{d-1}}+o_n(1), $$ where $o_n(1)\to 0$ as $n\to\infty$. The main purpose of this paper is to investigate this conjecture. We show that the situation is mixed. On the negative side, the conjecture fails for infinitely many average degrees $d>2$, via constructions based on bipartite Ramanujan graphs. On the positive side, it holds in two important settings: we verify it for all average degrees $d\le 2$, and we prove it for all regular graphs. In fact, for regular graphs we obtain stronger bounds comparing higher Laplacian eigenvalues. As a consequence, we show that for every fixed $d\ge 3$ and every $\varepsilon>0$, every sufficiently large $d$-regular Ramanujan graph has linearly many adjacency eigenvalues below $-2\sqrt{d-1}+\varepsilon$, thereby strengthening earlier results of Li and Cioab\u{a} by giving an unconditional result of this form. We also settle two related conjectures: one of You and Liu concerning the maximum Laplacian eigenratio of trees, and one of Gu concerning the Hamiltonicity of graphs with large Laplacian eigenratio.