Full-shape BOSS constraints on dark matter interacting with dark radiation and lifting the $S_8$ tension
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866917777951948800 |
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| author | Rubira, Henrique Mazoun, Asmaa Garny, Mathias |
| author_facet | Rubira, Henrique Mazoun, Asmaa Garny, Mathias |
| contents | In this work we derive constraints on interacting dark matter-dark radiation models from a full-shape analysis of BOSS-DR12 galaxy clustering data, combined with Planck legacy cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements. We consider a set of models parameterized within the effective theory of structure formation (ETHOS), quantifying the lifting of the $S_8$ tension in view of KiDS weak-lensing results. The most favorable scenarios point to a fraction $f\sim 10-100\%$ of interacting dark matter as well as a dark radiation temperature that is smaller by a factor $ξ\sim 0.1-0.15$ compared to the CMB, leading to a reduction of the tension to the $\sim 1σ$ level. The temperature dependence of the interaction rate favored by relaxing the $S_8$ tension is realized for a weakly coupled unbroken non-Abelian $SU(N)$ gauge interaction in the dark sector. To map our results onto this $SU(N)$ model, we compute higher-order corrections due to Debye screening. We find a lower bound $α_d\equiv g_d^2/(4π)\gtrsim 10^{-8} (10^{-9})$ for dark matter mass $1000 (1)$ GeV for relaxing the $S_8$ tension, consistent with upper bounds from galaxy ellipticities and compatible with self-interactions relevant for small-scale structure formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_03974 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Full-shape BOSS constraints on dark matter interacting with dark radiation and lifting the $S_8$ tension Rubira, Henrique Mazoun, Asmaa Garny, Mathias Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology In this work we derive constraints on interacting dark matter-dark radiation models from a full-shape analysis of BOSS-DR12 galaxy clustering data, combined with Planck legacy cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements. We consider a set of models parameterized within the effective theory of structure formation (ETHOS), quantifying the lifting of the $S_8$ tension in view of KiDS weak-lensing results. The most favorable scenarios point to a fraction $f\sim 10-100\%$ of interacting dark matter as well as a dark radiation temperature that is smaller by a factor $ξ\sim 0.1-0.15$ compared to the CMB, leading to a reduction of the tension to the $\sim 1σ$ level. The temperature dependence of the interaction rate favored by relaxing the $S_8$ tension is realized for a weakly coupled unbroken non-Abelian $SU(N)$ gauge interaction in the dark sector. To map our results onto this $SU(N)$ model, we compute higher-order corrections due to Debye screening. We find a lower bound $α_d\equiv g_d^2/(4π)\gtrsim 10^{-8} (10^{-9})$ for dark matter mass $1000 (1)$ GeV for relaxing the $S_8$ tension, consistent with upper bounds from galaxy ellipticities and compatible with self-interactions relevant for small-scale structure formation. |
| title | Full-shape BOSS constraints on dark matter interacting with dark radiation and lifting the $S_8$ tension |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2209.03974 |