Impacts of the simulated standard siren on estimating cosmological parameters

TL;DR

This paper demonstrates how simulated gravitational wave standard sirens from binary neutron-star mergers, observed by the Einstein Telescope, can improve the accuracy and reduce degeneracies in estimating cosmological parameters.

Contribution

It introduces a method to simulate GW standard sirens and assesses their impact on cosmological parameter inference, highlighting their usefulness in breaking parameter degeneracies.

Findings

GW data improves cosmological parameter accuracy

GW data helps break parameter degeneracies

Simulated GW data covers redshift range [0,3]

Abstract

We propose a method based on the process of extracting gravitational wave (GW) parameters from GW signals to simulate the binary neutron-star (BNS) merging events. We simulate 1000 GW standard sirens based on the observation of the Einstein Telescope (ET). Almost all the simulated GW data are in the redshift range of $[0,3]$. The role of the GW standard siren in the inference of the cosmological parameters is investigated. We find that the GW data can help improve the accuracy of cosmological parameters. Moreover, the degeneracy of cosmological parameters is broken by the GW data. The GW standard siren is helpful for the constraint of the cosmological parameters.