Cosmology from Nx2pt Analyses of SKAO Wide-Area Surveys
Ian Harrison, Ziad Sakr, Giulia Piccirilli, Chandra Shekhar Saraf, Jacobo Asorey, Benedict Bahr-Kalus, José Fonseca, Marina Migliaccio, David Parkinson, Cora Uhlemann
astro-ph.CO
Submitted: 2026-07-13
Comments: 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
License: http://creativecommons.org/licenses/by-nc-sa/4.0/
The gist: 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.
Terminology
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 times2 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 times2 pt analysis will be able to deliver measurements of about1% precision on CDM cosmological parameters. We also explore dynamical dark energy in the w 0, w a model, the sum of neutrino masses M nu, and the background curvature k.
Sources
- Anticipated Performance of the Square Kilometre Array -- Phase 1 (SKA1)
- Detection of the Cosmological 21 cm Signal in Auto-correlation at z ~ 1 with the Canadian Hydrogen Intensity Mapping Experiment
- Single-dish HI Intensity Mapping with the SKAO: Precursor Progress with MeerKAT's Large Area Synoptic Survey (MeerKLASS)
- Dark Energy Survey Year 6 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
- Euclid Quick Data Release (Q1) -- Data release overview
- Euclid preparation. Galaxy power spectrum and bispectrum modelling
- EMU and Euclid: Detection of a radio-optical galaxy clustering cross-correlation signal between the Evolutionary Map of the Universe and Euclid
- EMU: Cross-correlating EMU Pilot Survey 1 with Dark Energy Survey to validate the radio galaxy bias and redshift distribution
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