# Improving cosmological parameter estimation with the future 21 cm observation from SKA

## TL;DR

Future 21 cm observations from SKA are expected to significantly enhance cosmological parameter estimation by breaking degeneracies and improving constraints on dark energy properties.

## Contribution

This paper demonstrates how simulated SKA 21 cm data can improve cosmological parameter constraints beyond current observations.

## Key findings

- SKA mock data breaks degeneracy between matter density and Hubble constant.
- Inclusion of SKA data significantly improves dark energy equation of state constraints.
- SKA observations enhance the overall precision of cosmological parameters.

## Abstract

Future observations of 21 cm emission from neutral hydrogen survey will become a promising approach to probe the large scale structure of Universe. In this paper, we investigate the impacts of Square Kilometer Array (SKA) 21 cm observation on the estimation of cosmological parameters. We use the simulated data of the baryonic acoustic oscillation (BAO) measurements based on the future SKA experiment with the intensity mapping (IM) technique to do the analysis. For the current observations, we use the latest cosmic microwave background (CMB) observation from {\it Planck} 2018, the optical BAO measurements, and the Type Ia supernovae (SN) observation (Pantheon compilation). We find that the SKA mock data could break the degeneracy between the matter density and the Hubble constant, further improving the cosmological constraints to a great extent. We also find that the constraint on the equation of state parameters of dark energy could be significantly improved by including the SKA mock data into the cosmological global fit.