Dark siren cross-correlations and the sensitivity of $H_0$ to methodological choices
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914540621398016 |
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| author | Cross-Parkin, Madeline L. Howlett, Cullan Giani, Leonardo Blake, Chris Davis, Tamara M. |
| author_facet | Cross-Parkin, Madeline L. Howlett, Cullan Giani, Leonardo Blake, Chris Davis, Tamara M. |
| contents | Gravitational wave sources act as absolute distance indicators, making them powerful probes of the present-day expansion rate of the Universe, $H_0$. The cross-correlation method combines gravitational wave events with galaxy catalogues to constrain cosmological parameters through their shared large-scale structure. In this work, we investigate how key methodological choices -- including covariance treatment, bias parametrisation for galaxies and gravitational wave events, and distance and redshift binning width -- affect the inferred value of $H_0$. We also study catalogue incompleteness, showing that selection effects can be incorporated directly into the theoretical prediction, without the need to model the missing population explicitly, a key advantage over the standard galaxy catalogue approach. Our results indicate that, with appropriate modelling choices and a sufficiently large sample of precise gravitational wave events, the systematic biases considered here can be effectively mitigated, highlighting the potential of the cross-correlation method for future dark siren precision cosmology. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_06783 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dark siren cross-correlations and the sensitivity of $H_0$ to methodological choices Cross-Parkin, Madeline L. Howlett, Cullan Giani, Leonardo Blake, Chris Davis, Tamara M. Cosmology and Nongalactic Astrophysics Gravitational wave sources act as absolute distance indicators, making them powerful probes of the present-day expansion rate of the Universe, $H_0$. The cross-correlation method combines gravitational wave events with galaxy catalogues to constrain cosmological parameters through their shared large-scale structure. In this work, we investigate how key methodological choices -- including covariance treatment, bias parametrisation for galaxies and gravitational wave events, and distance and redshift binning width -- affect the inferred value of $H_0$. We also study catalogue incompleteness, showing that selection effects can be incorporated directly into the theoretical prediction, without the need to model the missing population explicitly, a key advantage over the standard galaxy catalogue approach. Our results indicate that, with appropriate modelling choices and a sufficiently large sample of precise gravitational wave events, the systematic biases considered here can be effectively mitigated, highlighting the potential of the cross-correlation method for future dark siren precision cosmology. |
| title | Dark siren cross-correlations and the sensitivity of $H_0$ to methodological choices |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.06783 |