Cosmology from Synergies Between SKAO Surveys and Gravitational Wave Observations

arXiv:2606.26011 · astro-ph.CO · Submitted 2026-06-24 · Read on arXiv

Tessa Baker, Alberto Colombo, Steven Cunnington, Ulyana Dupletsa, José Fonseca, Ian Harrison, Konstantin Leyde, Simone Mastrogiovanni, Riccardo Murgia, Dounia Nanadoumgar-Lacroze, Tommaso Ronconi, Giulio Scelfo, Matteo Schulz, Marta Spinelli

astro-ph.CO

Submitted: 2026-06-24

Comments: Published in Advancing Astrophysics with the SKA II (AASKAII), 2026 (arXiv:2606.20366). Report-no: AASKAII/Baker01. Advancing Astrophysics with the SKA II (AASKAII) outlines the transformative scientific advances that will be enabled by the SKA telescopes. Report-no: AASKAII/Baker01

Code: https://github.com/cmbant/CAMB

License: http://creativecommons.org/licenses/by-nc-sa/4.0/

The gist: Both radio surveys and gravitational wave observations have the potential to probe unprecedented volumes in the Universe with systematics independent of existing cosmological probes.

Terminology

Calibration — 6× in this paper · explained in 7 episodes
Clustering — 5× in this paper · explained in 2 episodes
Trace — 4× in this paper · explained in 2 episodes
Accuracy — 3× in this paper · explained in 1 episode
Angular cross-correlation — 3× in this paper · explained in 1 episode
Bayesian Inference — 3× in this paper · explained in 5 episodes
N-body simulations — 3× in this paper · explained in 2 episodes
Cosmic Explorer — 2× in this paper
Einstein Telescope — 2× in this paper
Fidelity — 2× in this paper · explained in 2 episodes
21-cm intensity mapping — 1× in this paper · explained in 2 episodes
Core — 1× in this paper · explained in 2 episodes
Dark Energy Spectroscopic Instrument — 1× in this paper
Hubble Tension — 1× in this paper · explained in 9 episodes
Matter Power Spectrum — 1× in this paper · explained in 2 episodes
Metallicity — 1× in this paper · explained in 3 episodes
Robustness — 1× in this paper · explained in 5 episodes
Signal-to-noise ratio (SNR) — 1× in this paper · explained in 2 episodes
Universe Cosmic Microwave Background — 1× in this paper

Abstract

Both radio surveys and gravitational wave observations have the potential to probe unprecedented volumes in the Universe with systematics independent of existing cosmological probes. This gives them the potential, especially in combination, to solve some of the outstanding issues in cosmology. Here we show how the use of radio observations as electromagnetic signals tracing large scale structures can be used to provide information on gravitational wave standard sirens. By providing a way to link luminosity distance to redshift, this combination can constrain the expansion history of the Universe, and provide information on the Hubble constant (H 0). We describe the utility of SKA-Mid neutral hydrogen intensity maps, galaxy redshift surveys, and continuum galaxy surveys compared to and in conjunction with large contemporaneous optical surveys. Such radio tracers provide a unique, large volume and high redshift information for gravitational wave source, capable of probing effectively the expansion history of the Universe H(z).

Terminology

Abstract

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