Uncertainties in the Hubble Constant from Peculiar Velocities
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915123286769664 |
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| author | Hollinger, Amber M. Hudson, Michael J. |
| author_facet | Hollinger, Amber M. Hudson, Michael J. |
| contents | Recent measurements of the Hubble constant using type Ia supernovae explicitly correct for their estimated peculiar velocities using the 2M++ reconstruction of the local density field. The amount of uncertainty from this reconstruction procedure has thus far been unquantified. To rectify this, we use mock universe realisations of the 2M++ catalogue and generate predicted peculiar velocities using the same method as the predictions that are used to correct for the Pantheon+ catalogue. We find that the method yields uncertainties of 0.3 km/s/Mpc and hence subdominant to the total uncertainty in H0. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_15704 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Uncertainties in the Hubble Constant from Peculiar Velocities Hollinger, Amber M. Hudson, Michael J. Cosmology and Nongalactic Astrophysics Recent measurements of the Hubble constant using type Ia supernovae explicitly correct for their estimated peculiar velocities using the 2M++ reconstruction of the local density field. The amount of uncertainty from this reconstruction procedure has thus far been unquantified. To rectify this, we use mock universe realisations of the 2M++ catalogue and generate predicted peculiar velocities using the same method as the predictions that are used to correct for the Pantheon+ catalogue. We find that the method yields uncertainties of 0.3 km/s/Mpc and hence subdominant to the total uncertainty in H0. |
| title | Uncertainties in the Hubble Constant from Peculiar Velocities |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.15704 |