First observational constraints on cosmic backreaction over an extended redshift range
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908959884967936 |
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| author | Koksbang, S. M. |
| author_facet | Koksbang, S. M. |
| contents | In the recent preprint arXiv:2604.07244v1, the authors introduce a novel combination of redshift, distance, and expansion rate observables for constraining cosmic backreaction. The current work presents a first application of the method, yielding the first direct constraints on the total cosmic backreaction in our Universe over a significant redshift range. The constraints are consistent with vanishing backreaction within one standard deviation. However, the constraints are fairly weak and significant backreaction cannot be ruled out. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11249 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | First observational constraints on cosmic backreaction over an extended redshift range Koksbang, S. M. Cosmology and Nongalactic Astrophysics In the recent preprint arXiv:2604.07244v1, the authors introduce a novel combination of redshift, distance, and expansion rate observables for constraining cosmic backreaction. The current work presents a first application of the method, yielding the first direct constraints on the total cosmic backreaction in our Universe over a significant redshift range. The constraints are consistent with vanishing backreaction within one standard deviation. However, the constraints are fairly weak and significant backreaction cannot be ruled out. |
| title | First observational constraints on cosmic backreaction over an extended redshift range |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2604.11249 |