# A transfer principle and applications to eigenvalue estimates for graphs

### Omid Amini

École Normale Supérieure, Paris, France### David Cohen-Steiner

INRIA, Sophia Antipolis, France

## Abstract

In this paper, we prove a variant of the Burger–Brooks transfer principle which, combined with recent eigenvalue bounds for surfaces, allows to obtain upper bounds on the eigenvalues of graphs as a function of their genus. More precisely, we show the existence of a universal constants $C$ such that the $k$th eigenvalue $λ_{k}$ of the normalized Laplacian of a graph $G$ of (geometric) genus $g$ on $n$ vertices satisfies

where $d_{max}$ denotes the maximum valence of vertices of the graph. Our result is tight up to a change in the value of the constant $C$, and improves recent results of Kelner, Lee, Price and Teng on bounded genus graphs.

To show that the transfer theorem might be of independent interest, we relate eigenvalues of the Laplacian on a metric graph to the eigenvalues of its simple graph models, and discuss an application to the mesh partitioning problem, extending results of Miller–Teng–Thurston–Vavasis and Spielman–Teng to arbitrary meshes.

## Cite this article

Omid Amini, David Cohen-Steiner, A transfer principle and applications to eigenvalue estimates for graphs. Comment. Math. Helv. 93 (2018), no. 1, pp. 203–223

DOI 10.4171/CMH/433