COLA with massive neutrinos
COLA with massive neutrinos
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DOI：
10.1088/1475-7516/2017/10/054
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发表时间：
2017-05
影响因子：
6.4
通讯作者：
B. S. Wright;H. Winther;K. Koyama
中科院分区：
文献类型：
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作者：
B. S. Wright;H. Winther;K. Koyama
大质量中微子对冷暗物质微扰增长的影响是一个依赖于尺度的牛顿常数，并导致依赖于尺度的增长因子，就像我们在广义相对论之外的引力模型中经常发现的那样。我们展示了如何在拉格朗日微扰理论中计算ΛCDM和一般修正引力宇宙学与大质量中微子相结合的增长因子，以用于COLA及其扩展。我们在MG-PICOLA中实现了这一点与Brandbyge和Hannestad基于网格的大质量中微子方法，并将COLA模拟与具有大质量中微子的ΛCDM和f（R）引力的全N体模拟进行了比较。我们的实现是计算成本低，如果基本的宇宙学已经有尺度依赖的增长因素，它被证明能够产生的结果，匹配N-体的总和CDM物质功率谱高达k 1 h/Mpc的百分比水平的准确性。
The effect of massive neutrinos on the growth of cold dark matter perturbations acts as a scale-dependent Newton's constant and leads to scale-dependent growth factors just as we often find in models of gravity beyond General Relativity. We show how to compute growth factors for ΛCDM and general modified gravity cosmologies combined with massive neutrinos in Lagrangian perturbation theory for use in COLA and extensions thereof. We implement this together with the grid-based massive neutrino method of Brandbyge and Hannestad in MG-PICOLA and compare COLA simulations to full N-body simulations of ΛCDM and f(R) gravity with massive neutrinos. Our implementation is computationally cheap if the underlying cosmology already has scale-dependent growth factors and it is shown to be able to produce results that match N-body to percent level accuracy for both the total and CDM matter power-spectra up to k≲ 1 h/Mpc.