A New Limit on the Graviton Mass from the Convergence Scale of the CMB Dipole

TL;DR

This paper uses the convergence scale of the CMB dipole from galaxy surveys to set a new, extremely tight upper limit on the graviton mass, significantly improving previous constraints.

Contribution

It introduces a novel method to constrain the graviton mass using the convergence scale of the galaxy clustering dipole, providing a much tighter bound than previous gravitational wave measurements.

Findings

Graviton mass is constrained to less than 5x10^{-32} eV.

The new limit surpasses previous gravitational wave constraints by a factor of 2.5x10^8.

The convergence scale of galaxy clustering informs fundamental physics limits.

Abstract

The clustering dipole in the 2MASS galaxy survey converges on a scale of ~400Mpc to the local peculiar velocity inferred from the Cosmic-Microwave-Background dipole. I show that this limits the graviton mass in Yukawa theories of gravity to less than 5x10^{-32}eV. The new limit is 2.5x10^8 times tighter than the latest constraint from gravitational waves detected by the LIGO-Virgo-KAGRA collaboration.