cosmology

Cosmology from Nx2pt Analyses of SKAO Wide-Area Surveys

arXiv:2607.11254

summary

The paper forecasts how combined analyses of galaxy clustering, weak lensing, galaxy‑galaxy lensing and 21 cm intensity mapping from SKA‑Mid surveys can measure ΛCDM parameters to about 1% precision and constrain extensions such as dynamical dark energy, neutrino mass, and curvature.

Abstract

SKAO surveys will provide an unprecedented window into the large-scale structure of the universe through HI 21cm galaxy and intensity mapping surveys, and radio continuum surveys. We present forecasts for the cosmological constraining power of `` $N \times 2 pt$ '' analyses -- which combine galaxy clustering, galaxy weak lensing, galaxy-galaxy lensing signals and 21cm Intensity Maps. By assuming cosmology surveys from an SKA-Mid AA4, we show that such an $N \times 2 pt$ analysis will be able to deliver measurements of $\sim 1%$ precision on $I^$ CDM cosmological parameters. We also explore dynamical dark energy in the $w_{0}, w_{a}$ model, the sum of neutrino masses $M_{I^} ½$ , and the background curvature $I^c ◯_{k}$ .

Published in Advancing Astrophysics with the SKA II (AASKAII), 2026 (arXiv:2606.20366). Report-no:AASKAII/Harrison01. Advancing Astrophysics with the SKA II (AASKAII) outlines the transformative scientific advances that will be enabled by the SKA telescopes

Topics & keywords

#large-scale structure #21cm intensity mapping #galaxy clustering #weak lensing #cosmological parameter estimationN×2pt analysisSKA-MidΛCDMw0wa dark energyneutrino massspatial curvature