Effects of primordial fluctuations on relic neutrino simulations
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929589438119936 |
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| author | Zimmer, Fabian Abellán, Guillermo Franco Ando, Shin'ichiro |
| author_facet | Zimmer, Fabian Abellán, Guillermo Franco Ando, Shin'ichiro |
| contents | After decoupling, relic neutrinos traverse the evolving gravitational imhomogeneities along their trajectories. Once they turn non-relativistic, this results in a significant amplification of the anisotropies in the cosmic neutrino background (C$ν$B). Past studies have reconstructed the phase-space distribution of relic neutrinos from the local distribution of matter (accounting for the Milky Way halo and the surrounding large-scale structures), but have neglected the C$ν$B anisotropies in the initial conditions of neutrino trajectories. Using our previously developed N-1-body simulation framework, we show that including these primordial fluctuations in the initial conditions can be important, as it produces similar effects on the abundance and anisotropies of the C$ν$B as the inclusion of large-scale structures beyond the Milky Way halo. Interpretability of data from future C$ν$B observatories like PTOLEMY therefore depends on correctly modelling these effects. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_14582 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effects of primordial fluctuations on relic neutrino simulations Zimmer, Fabian Abellán, Guillermo Franco Ando, Shin'ichiro Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology After decoupling, relic neutrinos traverse the evolving gravitational imhomogeneities along their trajectories. Once they turn non-relativistic, this results in a significant amplification of the anisotropies in the cosmic neutrino background (C$ν$B). Past studies have reconstructed the phase-space distribution of relic neutrinos from the local distribution of matter (accounting for the Milky Way halo and the surrounding large-scale structures), but have neglected the C$ν$B anisotropies in the initial conditions of neutrino trajectories. Using our previously developed N-1-body simulation framework, we show that including these primordial fluctuations in the initial conditions can be important, as it produces similar effects on the abundance and anisotropies of the C$ν$B as the inclusion of large-scale structures beyond the Milky Way halo. Interpretability of data from future C$ν$B observatories like PTOLEMY therefore depends on correctly modelling these effects. |
| title | Effects of primordial fluctuations on relic neutrino simulations |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2407.14582 |