Distinguishing the nature of dark matter by mapping cosmic filaments from Lyman-alpha emission
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910005941239808 |
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| author | Liu, Yizhou Gao, Liang Liao, Shihong Zhu, Kai Jing, Yingjie Hu, Huijie |
| author_facet | Liu, Yizhou Gao, Liang Liao, Shihong Zhu, Kai Jing, Yingjie Hu, Huijie |
| contents | The standard $Λ$CDM cosmological model predicts that cosmic filaments are highly clumpy, whereas warm dark matter -- invoked to address small-scale challenges in $Λ$CDM -- produces filaments that are noticeably smoother and less structured. In this work, we investigate the potential of Lyman $α$ (Ly$α$) emission to trace cosmic filaments at redshifts $z=2.5$ and $z=4$, and assess their potential for constraining the nature of dark matter. Our analysis shows that Ly$α$ filaments provide a promising observational probe of dark matter: at $z=4$, differences in filament smoothness and surface brightness serve as distinctive signatures between models. Looking ahead, the upcoming generation of 30-meter class telescopes will be critical for enabling these measurements, offering a compelling opportunity to distinguish the nature of dark matter by mapping the structure of cosmic filaments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_22677 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Distinguishing the nature of dark matter by mapping cosmic filaments from Lyman-alpha emission Liu, Yizhou Gao, Liang Liao, Shihong Zhu, Kai Jing, Yingjie Hu, Huijie Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies The standard $Λ$CDM cosmological model predicts that cosmic filaments are highly clumpy, whereas warm dark matter -- invoked to address small-scale challenges in $Λ$CDM -- produces filaments that are noticeably smoother and less structured. In this work, we investigate the potential of Lyman $α$ (Ly$α$) emission to trace cosmic filaments at redshifts $z=2.5$ and $z=4$, and assess their potential for constraining the nature of dark matter. Our analysis shows that Ly$α$ filaments provide a promising observational probe of dark matter: at $z=4$, differences in filament smoothness and surface brightness serve as distinctive signatures between models. Looking ahead, the upcoming generation of 30-meter class telescopes will be critical for enabling these measurements, offering a compelling opportunity to distinguish the nature of dark matter by mapping the structure of cosmic filaments. |
| title | Distinguishing the nature of dark matter by mapping cosmic filaments from Lyman-alpha emission |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.22677 |