Determining the Hubble Constant through Cross-Correlation of Galaxies and Gravitational Waves
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917035633541120 |
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| author | Pan, Jiaming Huterer, Dragan Avestruz, Camille Cheung, Damon H. T. Trott, Emery Dalal, Neal Jeong, Donghui |
| author_facet | Pan, Jiaming Huterer, Dragan Avestruz, Camille Cheung, Damon H. T. Trott, Emery Dalal, Neal Jeong, Donghui |
| contents | Gravitational wave (GW) standard sirens have the potential to measure the Hubble constant $H_0$ in the local universe independently of the distance ladder, and thus offer unique new insights into the Hubble tension. A key challenge with standard sirens is detecting their electromagnetic counterparts, and therefore assigning redshifts to the measured distances. One promising way to proceed is to utilize GW `dark sirens' -- events without an identified electromagnetic counterpart -- and cross-correlate their angular distribution with that of galaxies. We present a quantitative study of how precisely the Hubble constant can be measured using tomographic cross-correlation between galaxies and GW sources. Overall, we find that the constraints on $H_0$ will be limited by the quality and quantity of GW data. We find that percent-level constraints on $H_0$ will primarily depend on achieving small distance uncertainties ($σ_{d_L}=0.1\,d_L$), obtaining a large number of GW dark sirens ($\gtrsim$$5{,}000$), and accurate sky localization in the tomographic analysis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_19931 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Determining the Hubble Constant through Cross-Correlation of Galaxies and Gravitational Waves Pan, Jiaming Huterer, Dragan Avestruz, Camille Cheung, Damon H. T. Trott, Emery Dalal, Neal Jeong, Donghui Cosmology and Nongalactic Astrophysics Gravitational wave (GW) standard sirens have the potential to measure the Hubble constant $H_0$ in the local universe independently of the distance ladder, and thus offer unique new insights into the Hubble tension. A key challenge with standard sirens is detecting their electromagnetic counterparts, and therefore assigning redshifts to the measured distances. One promising way to proceed is to utilize GW `dark sirens' -- events without an identified electromagnetic counterpart -- and cross-correlate their angular distribution with that of galaxies. We present a quantitative study of how precisely the Hubble constant can be measured using tomographic cross-correlation between galaxies and GW sources. Overall, we find that the constraints on $H_0$ will be limited by the quality and quantity of GW data. We find that percent-level constraints on $H_0$ will primarily depend on achieving small distance uncertainties ($σ_{d_L}=0.1\,d_L$), obtaining a large number of GW dark sirens ($\gtrsim$$5{,}000$), and accurate sky localization in the tomographic analysis. |
| title | Determining the Hubble Constant through Cross-Correlation of Galaxies and Gravitational Waves |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.19931 |