Hot New Early Dark Energy: Dark Radiation Matter Decoupling
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arXiv
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| Format: | Preprint |
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2025
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| author | Garny, Mathias Niedermann, Florian Rubira, Henrique Sloth, Martin S. |
| author_facet | Garny, Mathias Niedermann, Florian Rubira, Henrique Sloth, Martin S. |
| contents | We present a microscopic model of the dark sector that resolves the Hubble tension within standard current datasets based on well-known fundamental principles, gauge symmetry and spontaneous symmetry breaking. It builds on the Hot New Early Dark Energy (Hot NEDE) setup, featuring a dark $SU(N)$ gauge symmetry broken to $SU(N-1)$ in a supercooled phase transition that creates a thermal bath of self-interacting dark radiation in the epoch between Big Bang Nucleosynthesis and recombination. Adding a fermion multiplet charged under the gauge symmetry provides a naturally stable component of dark matter that interacts with dark radiation. Spontaneous symmetry breaking predicts a decoupling of this interaction once the dark sector cools down, that we refer to as dark radiation matter decoupling (DRMD). We find agreement between the SH${}_0$ES determination of $H_0$ as well as combined Planck 2018, Pantheon+ and DESI baryon acoustic oscillation (BAO) data at 1.4$σ$ level, compared to a 5.7$σ$ tension in the $Λ$ Cold Dark Matter model. We also provide a simplified three-parameter DRMD model encoding the essential features, while the full model offers additional falsifiable predictions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03795 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hot New Early Dark Energy: Dark Radiation Matter Decoupling Garny, Mathias Niedermann, Florian Rubira, Henrique Sloth, Martin S. Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory We present a microscopic model of the dark sector that resolves the Hubble tension within standard current datasets based on well-known fundamental principles, gauge symmetry and spontaneous symmetry breaking. It builds on the Hot New Early Dark Energy (Hot NEDE) setup, featuring a dark $SU(N)$ gauge symmetry broken to $SU(N-1)$ in a supercooled phase transition that creates a thermal bath of self-interacting dark radiation in the epoch between Big Bang Nucleosynthesis and recombination. Adding a fermion multiplet charged under the gauge symmetry provides a naturally stable component of dark matter that interacts with dark radiation. Spontaneous symmetry breaking predicts a decoupling of this interaction once the dark sector cools down, that we refer to as dark radiation matter decoupling (DRMD). We find agreement between the SH${}_0$ES determination of $H_0$ as well as combined Planck 2018, Pantheon+ and DESI baryon acoustic oscillation (BAO) data at 1.4$σ$ level, compared to a 5.7$σ$ tension in the $Λ$ Cold Dark Matter model. We also provide a simplified three-parameter DRMD model encoding the essential features, while the full model offers additional falsifiable predictions. |
| title | Hot New Early Dark Energy: Dark Radiation Matter Decoupling |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2508.03795 |