Recent bounds on graviton mass using galaxy clusters

TL;DR

This paper reviews recent bounds on the graviton mass derived from galaxy cluster observations, highlighting advances in constraining modified gravity theories and comparing different methodologies.

Contribution

It provides a comprehensive overview of recent methods and results in constraining graviton mass using galaxy clusters, updating the limited historical bounds.

Findings

Multiple recent bounds on graviton mass from galaxy clusters.

Different methods yield consistent constraints.

Improved limits compared to the 1974 estimate.

Abstract

Although galaxy clusters have proved to be wonderful laboratories for testing a plethora of modified gravity theories and other exotic alternatives to $\Lambda$CDM, until a few years ago, there was only one paper (from 1974), which obtained a limit on graviton mass of $\mathcal{O}(10^{-29})$ eV with clusters. To rectify this, in the last few years multiple works have obtained different bounds on graviton mass using single cluster data as well as stacking galaxy catalogs. We review these recent limits on graviton mass using galaxy clusters obtained using disparate methods.