Cosmological impact of $ν$DM interactions enhanced in narrow redshift ranges
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913859925704704 |
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| author | Trojanowski, Sebastian Zu, Lei |
| author_facet | Trojanowski, Sebastian Zu, Lei |
| contents | The impact of dark matter-neutrino ($ν$DM) interactions on cosmological perturbations has regained attention, spurred by indications of non-zero couplings from high-multipole cosmic microwave background data, weak lensing, and Lyman-$α$ observations. We demonstrate that a similar observational preference is obtained if $ν$DM interactions are primarily enhanced during a specific epoch, $z\sim (10^4-10^5)$, leading to $>3σ$ preference for a non-zero interaction in the combined Atacama Cosmology Telescope and cosmic shear data. This redshift-limited enhancement circumvents other cosmological and astrophysical bounds and can be achieved within a neutrino portal dark matter framework incorporating resonantly enhanced scattering rates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_20396 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological impact of $ν$DM interactions enhanced in narrow redshift ranges Trojanowski, Sebastian Zu, Lei Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology The impact of dark matter-neutrino ($ν$DM) interactions on cosmological perturbations has regained attention, spurred by indications of non-zero couplings from high-multipole cosmic microwave background data, weak lensing, and Lyman-$α$ observations. We demonstrate that a similar observational preference is obtained if $ν$DM interactions are primarily enhanced during a specific epoch, $z\sim (10^4-10^5)$, leading to $>3σ$ preference for a non-zero interaction in the combined Atacama Cosmology Telescope and cosmic shear data. This redshift-limited enhancement circumvents other cosmological and astrophysical bounds and can be achieved within a neutrino portal dark matter framework incorporating resonantly enhanced scattering rates. |
| title | Cosmological impact of $ν$DM interactions enhanced in narrow redshift ranges |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.20396 |