Multidimensionality of the Hubble tension: the roles of $Ω_m$ and $ω_c$
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arXiv
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| Format: | Preprint |
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2024
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| author | Pedrotti, Davide Jiang, Jun-Qian Escamilla, Luis A. da Costa, Simony Santos Vagnozzi, Sunny |
| author_facet | Pedrotti, Davide Jiang, Jun-Qian Escamilla, Luis A. da Costa, Simony Santos Vagnozzi, Sunny |
| contents | The Hubble tension is inherently multidimensional, and bears important implications for parameters beyond $H_0$. We discuss the key role of the matter density parameter $Ω_m$ and the physical cold dark matter density $ω_c$. We argue that once $Ω_m$ and the physical baryon density $ω_b$ are calibrated, through Baryon Acoustic Oscillations (BAO) and/or Type Ia Supernovae (SNeIa) for $Ω_m$, and via Big Bang Nucleosynthesis for $ω_b$, any model raising $H_0$ requires raising $ω_c$ and, under minimal assumptions, also the clustering parameter $S_8$. We explicitly verify that this behaviour holds when analyzing recent BAO and SNeIa data. We argue that a calibration of $Ω_m$ as reliable and model-independent as possible should be a priority in the Hubble tension discussion, and an interesting possibility in this sense could be represented by galaxy cluster gas mass fraction measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04530 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multidimensionality of the Hubble tension: the roles of $Ω_m$ and $ω_c$ Pedrotti, Davide Jiang, Jun-Qian Escamilla, Luis A. da Costa, Simony Santos Vagnozzi, Sunny Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory The Hubble tension is inherently multidimensional, and bears important implications for parameters beyond $H_0$. We discuss the key role of the matter density parameter $Ω_m$ and the physical cold dark matter density $ω_c$. We argue that once $Ω_m$ and the physical baryon density $ω_b$ are calibrated, through Baryon Acoustic Oscillations (BAO) and/or Type Ia Supernovae (SNeIa) for $Ω_m$, and via Big Bang Nucleosynthesis for $ω_b$, any model raising $H_0$ requires raising $ω_c$ and, under minimal assumptions, also the clustering parameter $S_8$. We explicitly verify that this behaviour holds when analyzing recent BAO and SNeIa data. We argue that a calibration of $Ω_m$ as reliable and model-independent as possible should be a priority in the Hubble tension discussion, and an interesting possibility in this sense could be represented by galaxy cluster gas mass fraction measurements. |
| title | Multidimensionality of the Hubble tension: the roles of $Ω_m$ and $ω_c$ |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2408.04530 |