Geometric Constraints on the Pre-Recombination Expansion History from the Hubble Tension
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866909000571813888 |
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| author | Pedrotti, Davide |
| author_facet | Pedrotti, Davide |
| contents | I perform a model-independent reconstruction of the background pre-recombination expansion history of the Universe. I find that purely early-time resolutions to the Hubble tension, satisfying the geometric CMB constraints, exist at the background level. This class of solutions requires a smooth transition around matter-radiation equality, characterized by a $\simeq 15\%$ expansion rate enhancement prior to recombination. This result serves as a blueprint for future model-building approaches, providing a background stress-test for Hubble tension proposals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25813 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Geometric Constraints on the Pre-Recombination Expansion History from the Hubble Tension Pedrotti, Davide Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology I perform a model-independent reconstruction of the background pre-recombination expansion history of the Universe. I find that purely early-time resolutions to the Hubble tension, satisfying the geometric CMB constraints, exist at the background level. This class of solutions requires a smooth transition around matter-radiation equality, characterized by a $\simeq 15\%$ expansion rate enhancement prior to recombination. This result serves as a blueprint for future model-building approaches, providing a background stress-test for Hubble tension proposals. |
| title | Geometric Constraints on the Pre-Recombination Expansion History from the Hubble Tension |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.25813 |