A generic $ω_b$ tension in early-time solutions to the Hubble tension
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866913009329242112 |
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| author | Giovanetti, Cara |
| author_facet | Giovanetti, Cara |
| contents | I show that early-time (pre-recombination) solutions to the Hubble tension are generically expected to increase the preferred baryon density $ω_b$. This puts these models in tension with Big Bang Nucleosynthesis (BBN), as measurements of primordial deuterium constrain $ω_b$ at percent level. I show that existing analyses are in tension with the BBN determination of $ω_b$, and that including a likelihood component for primordial deuterium deters two representative models from recovering a high $H_0$, and leads to worse fits to CMB, BAO, supernova, and BBN data than $Λ$CDM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05095 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A generic $ω_b$ tension in early-time solutions to the Hubble tension Giovanetti, Cara Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology I show that early-time (pre-recombination) solutions to the Hubble tension are generically expected to increase the preferred baryon density $ω_b$. This puts these models in tension with Big Bang Nucleosynthesis (BBN), as measurements of primordial deuterium constrain $ω_b$ at percent level. I show that existing analyses are in tension with the BBN determination of $ω_b$, and that including a likelihood component for primordial deuterium deters two representative models from recovering a high $H_0$, and leads to worse fits to CMB, BAO, supernova, and BBN data than $Λ$CDM. |
| title | A generic $ω_b$ tension in early-time solutions to the Hubble tension |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.05095 |