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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2312.05896 |
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| _version_ | 1866910721374158848 |
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| author | Sanejouand, Yves-Henri |
| author_facet | Sanejouand, Yves-Henri |
| contents | Magnitude predictions of $Λ$CDM, as parametrized by the Planck collaboration, are not consistent with the supernova data of the whole Pantheon+ sample even when, in order to take into account the uncertainty about its value, the Hubble constant is adjusted. This is a likely consequence of the increase of the number of low-redshift supernovae in the Pantheon+ sample, with respect to previous such samples. Indeed, when supernovae at redshifts below 0.035 are ignored, with H0=73.4 km/s/Mpc, $Λ$CDM predictions become consistent with Pantheon+ data. Interestingly, this is also the case when subsets of low-redshift supernovae roughly centered on the direction of the CMB dipole are considered, together with high-redshift ones, at least when CMB and peculiar velocities corrections are taken into account for the redshifts. These results seem robust, since they are also obtained with a simple, single-parameter tired-light model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_05896 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A robust assessment of the local anisotropy of the Hubble constant Sanejouand, Yves-Henri Cosmology and Nongalactic Astrophysics Magnitude predictions of $Λ$CDM, as parametrized by the Planck collaboration, are not consistent with the supernova data of the whole Pantheon+ sample even when, in order to take into account the uncertainty about its value, the Hubble constant is adjusted. This is a likely consequence of the increase of the number of low-redshift supernovae in the Pantheon+ sample, with respect to previous such samples. Indeed, when supernovae at redshifts below 0.035 are ignored, with H0=73.4 km/s/Mpc, $Λ$CDM predictions become consistent with Pantheon+ data. Interestingly, this is also the case when subsets of low-redshift supernovae roughly centered on the direction of the CMB dipole are considered, together with high-redshift ones, at least when CMB and peculiar velocities corrections are taken into account for the redshifts. These results seem robust, since they are also obtained with a simple, single-parameter tired-light model. |
| title | A robust assessment of the local anisotropy of the Hubble constant |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2312.05896 |