Grid based linear neutrino perturbations in cosmological N-body simulations

被引:102
作者
Brandbyge, Jacob [1 ]
Hannestad, Steen [1 ]
机构
[1] Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 05期
关键词
power spectrum; cosmological simulations; cosmological neutrinos; GRAVITATIONAL-INSTABILITY;
D O I
10.1088/1475-7516/2009/05/002
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a novel, fast and precise method for including the effect of light neutrinos in cosmological N-body simulations. The effect of the neutrino component is included by using the linear theory neutrino perturbations in the calculation of the gravitational potential in the N-body simulation. By comparing this new method with the full non-linear evolution first presented in [1], where the neutrino component was treated as particles, we find that the new method calculates the matter power spectrum with an accuracy better than 1% for Sigma m(v) less than or similar to 0.5eV at z = 0. This error scales approximately as(Sigma m(v))2,making the new linear neutrino method extremely accurate for a total neutrino mass in the range 0.05-0.3 eV. At z = 1 the error is below 0.3% for Sigma m(v) less than or similar to 0.5 eV and becomes negligible at higher redshifts. This new method is computationally much more efficient than representing the neutrino component by N-body particles.
引用
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页数:15
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