Measuring the Hubble constant through the galaxy pairwise peculiar velocity
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913626375323648 |
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| author | Zhang, Wangzheng Chu, Ming-chung Liao, Shihong Yeung, Shek Hu, Hui-Jie |
| author_facet | Zhang, Wangzheng Chu, Ming-chung Liao, Shihong Yeung, Shek Hu, Hui-Jie |
| contents | The Hubble constant $H_0$, the current expansion rate of the universe, is one of the most important parameters in cosmology. The cosmic expansion regulates the mutually approaching motion of a pair of celestial objects due to their gravity. Therefore, the mean pairwise peculiar velocity of celestial objects, which quantifies their relative motion, is sensitive to both $H_0$ and the dimensionless total matter density $Ω_m$. Based on this, using the Cosmicflows-4 data, we measured $H_0$ for the first time via the galaxy pairwise velocity in the nonlinear and quasi-linear range. Our results yield $H_0=75.5\pm1.4$ km s$^{-1}$ Mpc$^{-1}$ and $Ω_m=0.311^{+0.029}_{-0.028}$ . The uncertainties of $H_0$ and $Ω_m$ can be improved to around 0.6% and 2%, respectively, if the statistical errors become negligible in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_04660 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measuring the Hubble constant through the galaxy pairwise peculiar velocity Zhang, Wangzheng Chu, Ming-chung Liao, Shihong Yeung, Shek Hu, Hui-Jie Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies The Hubble constant $H_0$, the current expansion rate of the universe, is one of the most important parameters in cosmology. The cosmic expansion regulates the mutually approaching motion of a pair of celestial objects due to their gravity. Therefore, the mean pairwise peculiar velocity of celestial objects, which quantifies their relative motion, is sensitive to both $H_0$ and the dimensionless total matter density $Ω_m$. Based on this, using the Cosmicflows-4 data, we measured $H_0$ for the first time via the galaxy pairwise velocity in the nonlinear and quasi-linear range. Our results yield $H_0=75.5\pm1.4$ km s$^{-1}$ Mpc$^{-1}$ and $Ω_m=0.311^{+0.029}_{-0.028}$ . The uncertainties of $H_0$ and $Ω_m$ can be improved to around 0.6% and 2%, respectively, if the statistical errors become negligible in the future. |
| title | Measuring the Hubble constant through the galaxy pairwise peculiar velocity |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.04660 |