# The prospects of gravitational waves on constraining the anisotropy of the Universe

## TL;DR

This paper demonstrates that gravitational wave observations, specifically from binary neutron star mergers detected by the Einstein Telescope, can effectively constrain the anisotropy of the Universe, rivaling traditional supernova methods.

## Contribution

It introduces a simulation-based approach to use gravitational wave data for constraining cosmological anisotropy, highlighting the potential of future GW observations.

## Key findings

- 200 binary neutron star mergers can constrain anisotropy with high accuracy
- GW observations can match supernovae in constraining cosmological anisotropy
- Gravitational waves are a promising tool for cosmological studies

## Abstract

The observation of GW150914 indicated a new independent measurement of the luminosity distance of a gravitational wave event. In this paper, we constrain the anisotropy of the Universe by using gravitational wave events. We simulate hundreds of events of binary neutron star merging that may be observed by Einstein Telescope. Full simulation for producing process of gravitational wave data is employed. We find that 200 of binary neutron star merging in redshift $(0,1)$ observed by Einstein Telescope may constrain the anisotropy with an accuracy comparable to the result from Union2.1 supernovae. This result shows that gravitational waves can be a powerful tool in investigating the cosmological anisotropy.