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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.20396 |
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Table of 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.