Dark matter solution to the $H_{0}$ and $S_{8}$ tensions, and the integrated Sachs-Wolfe void anomaly
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2022
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| _version_ | 1866917638554255360 |
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| author | Naidoo, Krishna Jaber, Mariana Hellwing, Wojciech A. Bilicki, Maciej |
| author_facet | Naidoo, Krishna Jaber, Mariana Hellwing, Wojciech A. Bilicki, Maciej |
| contents | We consider a phenomenological model of dark matter with an equation-of-state $w$ that is negative and changing at late times. We show this couples the $H_{0}$ and $S_{8}$ tensions, alleviating them both simultaneously, reducing the $H_{0}$ tension from $\sim5σ$ to $\sim3σ$ and the $S_{8}$ tension from $\sim3σ$ to $\sim1σ$. Furthermore, the model provides an explanation for the anomalously large integrated Sachs-Wolfe (ISW) effect from cosmic voids, a unique consequence of the changing and negative equation-of-state. Observations of high ISW from cosmic voids may therefore be evidence that dark matter plays a significant role in both the $H_{0}$ and $S_{8}$ tensions. We predict the ISW from cosmic voids to be a factor of up to $\sim2$ greater in this model than what is expected from the standard model $Λ$CDM. These results extend to other degenerate models of dark matter, such as unified or interacting dark matter and dark energy models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_08102 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Dark matter solution to the $H_{0}$ and $S_{8}$ tensions, and the integrated Sachs-Wolfe void anomaly Naidoo, Krishna Jaber, Mariana Hellwing, Wojciech A. Bilicki, Maciej Cosmology and Nongalactic Astrophysics We consider a phenomenological model of dark matter with an equation-of-state $w$ that is negative and changing at late times. We show this couples the $H_{0}$ and $S_{8}$ tensions, alleviating them both simultaneously, reducing the $H_{0}$ tension from $\sim5σ$ to $\sim3σ$ and the $S_{8}$ tension from $\sim3σ$ to $\sim1σ$. Furthermore, the model provides an explanation for the anomalously large integrated Sachs-Wolfe (ISW) effect from cosmic voids, a unique consequence of the changing and negative equation-of-state. Observations of high ISW from cosmic voids may therefore be evidence that dark matter plays a significant role in both the $H_{0}$ and $S_{8}$ tensions. We predict the ISW from cosmic voids to be a factor of up to $\sim2$ greater in this model than what is expected from the standard model $Λ$CDM. These results extend to other degenerate models of dark matter, such as unified or interacting dark matter and dark energy models. |
| title | Dark matter solution to the $H_{0}$ and $S_{8}$ tensions, and the integrated Sachs-Wolfe void anomaly |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2209.08102 |