2023
DOI: 10.1088/1475-7516/2023/06/003
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Improving initialization and evolution accuracy of cosmological neutrino simulations

Abstract: Neutrino mass constraints are a primary focus of current and future large-scale structure (LSS) surveys. Non-linear LSS models rely heavily on cosmological simulations — the impact of massive neutrinos should therefore be included in these simulations in a realistic, computationally tractable, and controlled manner. A recent proposal to reduce the related computational cost employs a symmetric neutrino momentum sampling strategy in the initial conditions. We implement a modified version of this strat… Show more

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Cited by 4 publications
(2 citation statements)
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“…∼ 0.3 eV and below, treating the neutrino component linearly while solving for the full non-linear evolution of the CDM distribution is sufficient [18][19][20][21][22]. At larger masses, a non-linear treatment of the neutrino component is necessary to achieve sub-percent accuracy above k ∼ 1 hMpc −1 [22][23][24][25][26]. Including neutrinos as a separate particle species in N -body simulations has been shown to be an accurate route for such a treatment [27,28].…”
Section: Introductionmentioning
confidence: 99%
“…∼ 0.3 eV and below, treating the neutrino component linearly while solving for the full non-linear evolution of the CDM distribution is sufficient [18][19][20][21][22]. At larger masses, a non-linear treatment of the neutrino component is necessary to achieve sub-percent accuracy above k ∼ 1 hMpc −1 [22][23][24][25][26]. Including neutrinos as a separate particle species in N -body simulations has been shown to be an accurate route for such a treatment [27,28].…”
Section: Introductionmentioning
confidence: 99%
“…The accuracy of our neutrino implementation (neutrinos are not included as a separate species but instead are modeled in the evolution of the background cosmology) is discussed in Upadhye et al (2014). This approximation is accurate to 1% in the matter power spectrum when compared to simulations that treat neutrinos as separate particles for the range of light neutrino masses that are spanned by the emulator (Castorina et al 2015;Sullivan et al 2023).…”
Section: Simulationsmentioning
confidence: 99%