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| Format: | Preprint |
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2023
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| Online Access: | https://arxiv.org/abs/2311.07650 |
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| _version_ | 1866911846117670912 |
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| author | Song, Yunjia Zu, Ying |
| author_facet | Song, Yunjia Zu, Ying |
| contents | Massive neutrinos have non-negligible impact on the formation of large-scale structures. We investigate the impact of massive neutrinos on the halo assembly bias effect, measured by the relative halo bias $\hat{b}$ as a function of the curvature of the initial density peak $\hat{s}$, neutrino excess $ε_ν$, or halo concentration $\hat{c}$, using a large suite of $ΣM_ν{=}0.0$ eV and $0.4$ eV simulations with the same initial conditions. By tracing dark matter haloes back to their initial density peaks, we construct a catalogue of halo twins that collapsed from the same peaks but evolved separately with and without massive neutrinos, thereby isolating any effect of neutrinos on halo formation. We detect a $2\%$ weakening of the halo assembly bias as measured by $\hat{b}(ε_ν)$ in the presence of massive neutrinos. As there exists a significant correlation between $\hat{s}$ and $ε_ν$ ($r_{cc}{=}0.319$), the impact of neutrinos persists at a reduced level~($0.1\%$) in the halo assembly bias measured by $\hat{b}(\hat{s})$. However, we do not detect any neutrino-induced impact on $\hat{b}(\hat{c})$, consistent with earlier studies and the lack of correlation between $\hat{c}$ and $ε_ν$ ($r_{cc}{=}0.087$). We also discover an analogous assembly bias effect for the neutrino haloes, whose concentrations are anti-correlated with the large-scale clustering of neutrinos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_07650 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Elucidating the impact of massive neutrinos on halo assembly bias Song, Yunjia Zu, Ying Cosmology and Nongalactic Astrophysics Massive neutrinos have non-negligible impact on the formation of large-scale structures. We investigate the impact of massive neutrinos on the halo assembly bias effect, measured by the relative halo bias $\hat{b}$ as a function of the curvature of the initial density peak $\hat{s}$, neutrino excess $ε_ν$, or halo concentration $\hat{c}$, using a large suite of $ΣM_ν{=}0.0$ eV and $0.4$ eV simulations with the same initial conditions. By tracing dark matter haloes back to their initial density peaks, we construct a catalogue of halo twins that collapsed from the same peaks but evolved separately with and without massive neutrinos, thereby isolating any effect of neutrinos on halo formation. We detect a $2\%$ weakening of the halo assembly bias as measured by $\hat{b}(ε_ν)$ in the presence of massive neutrinos. As there exists a significant correlation between $\hat{s}$ and $ε_ν$ ($r_{cc}{=}0.319$), the impact of neutrinos persists at a reduced level~($0.1\%$) in the halo assembly bias measured by $\hat{b}(\hat{s})$. However, we do not detect any neutrino-induced impact on $\hat{b}(\hat{c})$, consistent with earlier studies and the lack of correlation between $\hat{c}$ and $ε_ν$ ($r_{cc}{=}0.087$). We also discover an analogous assembly bias effect for the neutrino haloes, whose concentrations are anti-correlated with the large-scale clustering of neutrinos. |
| title | Elucidating the impact of massive neutrinos on halo assembly bias |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2311.07650 |