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Upadhye, A, Kwan, J, McCarthy, IG, Salcido, J, Moran, KR, Lawrence, E and Wong, YYY (2024) Cosmic-E ν: An- emulator for the non-linear neutrino power spectrum. Monthly Notices of the Royal Astronomical Society, 530 (1). pp. 743-760. ISSN 0035-8711
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Cosmic-E ν An- emulator for the non-linear neutrino power spectrum.pdf - Published Version Available under License Creative Commons Attribution. Download (4MB) | Preview |
Abstract
Cosmology is poised to measure the neutrino mass sum M νand has identified several smaller-scale observables sensitive to neu- trinos, necessitating accurate predictions of neutrino clustering o v er a wide range of length scales. The FlowsForTheMasses non-linear perturbation theory for the the massive neutrino power spectrum, Δ 2 2 ν( k), agrees with its companion N -body simulation at the 10 per cent -15 per cent level for k ≤1 h Mpc -1 . Building upon the Mira-Titan IV emulator for the cold matter, we use FlowsForTheMasses to construct an emulator for Δ 2 ν( k), Cosmic-E ν, which co v ers a large range of cosmological parameters and neutrino fractions Ων, 0 h 2 ≤0.01 ( M ν≤0.93 eV). Consistent with FlowsForTheMasses at the 3.5 per cent level, it returns a power spectrum in milliseconds. Ranking the neutrinos by initial momenta, we also emulate the power spectra of momentum deciles, providing information about their perturbed distribution function. Comparing a M ν= 0.15 eV model to a wide range of N -body simulation methods, we find agreement to 3 per cent for k ≤3 k FS = 0.17 h Mpc -1 and to 19 per cent for k ≤0.4 h Mpc -1 . We find that the enhancement factor, the ratio of Δ 2 ν( k) to its linear-response equi v alent, is most strongly correlated with Ων, 0 h 2 , and also with the clustering amplitude σ8 . Furthermore, non-linearities enhance the free-streaming-limit scaling ∂ log ( Δ 2 ν/Δ 2 m ) / ∂ log ( M ν) beyond its linear value of 4, increasing the M ν-sensitivity of the small-scale neutrino density.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 02 Oct 2024 11:41 |
| Last Modified: | 02 Oct 2024 11:45 |
| DOI or ID number: | 10.1093/mnras/stae783 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24320 |
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