Can a secluded self-interacting dark sector generate detectable gravitational waves?
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912491902074880 |
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| author | Li, Song Yang, Jin Min Zhang, Mengchao Zhang, Yang Zhu, Rui |
| author_facet | Li, Song Yang, Jin Min Zhang, Mengchao Zhang, Yang Zhu, Rui |
| contents | In this work we study the possibility to detect the gravitational waves generated by a secluded self-interacting dark sector. ``Secluded'' means that the dark sector has almost no portal to the visible sector and thus its entropy is conserved by itself, and ``self-interacting'' means that dark matter in this model has a significant interaction to itself, making it consistent with the small-scale structure observations. A spontaneously broken $U(1)'$ is introduced for the interactions in the dark sector, and nearly massless dark radiation is also introduced to avoid the over-closure problem. Through a parameter space scan, we find that this model is highly constrained by the current observed effective number of neutrinos ($N_{\text{eff}}$) and the large-scale structure observable Lyman-$α$. Combined together, these two constraints make such a secluded self-interacting dark sector almost impossible to generate gravitational waves accessible at future projects like SKA or LISA. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04108 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Can a secluded self-interacting dark sector generate detectable gravitational waves? Li, Song Yang, Jin Min Zhang, Mengchao Zhang, Yang Zhu, Rui High Energy Physics - Phenomenology High Energy Astrophysical Phenomena In this work we study the possibility to detect the gravitational waves generated by a secluded self-interacting dark sector. ``Secluded'' means that the dark sector has almost no portal to the visible sector and thus its entropy is conserved by itself, and ``self-interacting'' means that dark matter in this model has a significant interaction to itself, making it consistent with the small-scale structure observations. A spontaneously broken $U(1)'$ is introduced for the interactions in the dark sector, and nearly massless dark radiation is also introduced to avoid the over-closure problem. Through a parameter space scan, we find that this model is highly constrained by the current observed effective number of neutrinos ($N_{\text{eff}}$) and the large-scale structure observable Lyman-$α$. Combined together, these two constraints make such a secluded self-interacting dark sector almost impossible to generate gravitational waves accessible at future projects like SKA or LISA. |
| title | Can a secluded self-interacting dark sector generate detectable gravitational waves? |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2502.04108 |