Clustering with Light (but Massive) Relics
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909965640269824 |
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| author | Kumar, Jason Sandick, Pearl Xu, Shuting |
| author_facet | Kumar, Jason Sandick, Pearl Xu, Shuting |
| contents | We consider the effect of Light (but Massive) Relics (LiMRs) on the clustering of matter in the early Universe. We account for the fact that LiMRs which are massive enough may cluster on large length scales at early times, and may thus impact weak lensing of the cosmic microwave background (CMB) even on small angular scales. In particular, we find that LiMRs in the $\gtrsim$ eV mass range (and even $> 10$ eV), can constitute a non-negligible component of dark matter. This opens up a class of scenarios in which energy is injected as dark radiation, but begins to redshift as matter before recombination, thus avoiding constraints on $ΔN_{eff}$ while providing an eV-range dark matter component. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14672 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Clustering with Light (but Massive) Relics Kumar, Jason Sandick, Pearl Xu, Shuting Cosmology and Nongalactic Astrophysics We consider the effect of Light (but Massive) Relics (LiMRs) on the clustering of matter in the early Universe. We account for the fact that LiMRs which are massive enough may cluster on large length scales at early times, and may thus impact weak lensing of the cosmic microwave background (CMB) even on small angular scales. In particular, we find that LiMRs in the $\gtrsim$ eV mass range (and even $> 10$ eV), can constitute a non-negligible component of dark matter. This opens up a class of scenarios in which energy is injected as dark radiation, but begins to redshift as matter before recombination, thus avoiding constraints on $ΔN_{eff}$ while providing an eV-range dark matter component. |
| title | Clustering with Light (but Massive) Relics |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.14672 |