Recent bounds on graviton mass using galaxy clusters

Abstract

Although galaxy clusters have proved to be wonderful laboratories for testing a plethora of modified gravity theories and other exotic alternatives to ΛCDM, until a few years ago, there was only one paper (from 1974), which obtained a limit on graviton mass (of 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.

Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations

“…Here, we use galaxy clusters in testing for variations in α. Galaxy clusters are the most massive, gravitationally collapsed objects in the universe and have proved to be wonderful laboratories for studying cosmology, structure formation, galaxy evolution, neutrino mass, graviton mass, various modified gravity theories etc [29][30][31]. In the past two decades, a large number of galaxy clusters have been discovered upto very high redshifts thanks to multi-wavelength surveys in optical, X-ray, and Sunyaev-Zeldovich (SZ, hereafter) at mm wavelengths which have mapped out large-area contiguous regions of the universe.…”

Constraints on variation of fine structure constant from joint SPT-SZ and XMM-Newton observations

“…Here, we use galaxy clusters in testing for variations in α. Galaxy clusters are the most massive, gravitationally collapsed objects in the universe and have been proved to be wonderful laboratories for studying cosmology, structure formation, galaxy evolution, neutrino mass, graviton mass, various modified gravity theories etc [20][21][22]. In the past two decades, a large number of galaxy clusters have been discovered upto very high redshifts thanks to multi-wavelength surveys in optical, X-ray, and Sunyaev-Zeldovich (SZ, hereafter) at mm wavelengths which have mapped out large-area contiguous regions of the universe.…”