New Early Dark Energy as a solution to the $H_0$ and $S_8$ tensions
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| Format: | Preprint |
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2023
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| _version_ | 1866914870705782784 |
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| author | Niedermann, Florian Sloth, Martin S. |
| author_facet | Niedermann, Florian Sloth, Martin S. |
| contents | New Early Dark Energy introduces a new phase of dark energy that decays in a fast-triggered phase transition around matter-radiation equality. The presence of a trigger mechanism sets it apart from other early dark energy models. Here, we will argue that New Early Dark Energy offers a simple and natural framework to extend $Λ$CDM while also providing a pathway to resolving the $H_0$ tension alongside its smaller cousin, the $S_8$ tension. At the microscopic level, we discuss the possibility that the trigger is either given by an ultralight scalar field or a dark sector temperature. In both cases, it prompts the transition of an $\mathrm{eV}$-mass scalar field from its false to its true minimum. Furthermore, we argue that the same phase transition could give rise to a dynamic process for generating neutrino masses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_03481 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | New Early Dark Energy as a solution to the $H_0$ and $S_8$ tensions Niedermann, Florian Sloth, Martin S. High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory New Early Dark Energy introduces a new phase of dark energy that decays in a fast-triggered phase transition around matter-radiation equality. The presence of a trigger mechanism sets it apart from other early dark energy models. Here, we will argue that New Early Dark Energy offers a simple and natural framework to extend $Λ$CDM while also providing a pathway to resolving the $H_0$ tension alongside its smaller cousin, the $S_8$ tension. At the microscopic level, we discuss the possibility that the trigger is either given by an ultralight scalar field or a dark sector temperature. In both cases, it prompts the transition of an $\mathrm{eV}$-mass scalar field from its false to its true minimum. Furthermore, we argue that the same phase transition could give rise to a dynamic process for generating neutrino masses. |
| title | New Early Dark Energy as a solution to the $H_0$ and $S_8$ tensions |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2307.03481 |