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arXiv · 2606.26011

Cosmology from Synergies Between SKAO Surveys and Gravitational Wave Observations

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
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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 \textit{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 (\hi) intensity maps, \hi\ 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 $H(z)$.

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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. 2026-06-24. Cosmology from Synergies Between SKAO Surveys and Gravitational Wave Observations. https://arxiv.org/abs/2606.26011

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