Authors
Yizhou Liu, Liang Gao, Shihong Liao, Kai Zhu, Yingjie Jing, Huijie Hu
Published in
Physical review letters. Volume 137. Issue 10. Pages 101002. Sep 04, 2026.
Abstract
The standard lambda cold dark matter cosmological model predicts that cosmic filaments are highly clumpy, whereas warm dark matter-invoked to address small-scale challenges in the lambda cold dark matter model-produces filaments that are noticeably smoother and less structured. In this Letter, we investigate the potential of Lyman-alpha 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 Lyman-alpha 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-m 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.
PMID:
42758991
Bibliographic data and abstract were imported from PubMed on 19 Sep 2026.
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