Cosmic-variance limited Baryon Acoustic Oscillations from the DEUS-FUR ΛCDM simulation
Cosmic-variance limited Baryon Acoustic Oscillations from the DEUS-FUR ΛCDM simulation
复制标题
DEUS-FUR ΛCDM 模拟中的宇宙方差限制重子声振荡
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Irène Balmès
中科院分区：
文献类型：
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作者：
Y. Rasera;Pier Stefano Corasaniti;J. Alimi;V. Bouillot;V. Reverdy;Irène Balmès
我们通过 DEUS-FUR $\Lambda$CDM 模型模拟研究了低红移物质功率谱中重子声振荡 (BAO) 的非线性演化。这是第一个涵盖完整可观测宇宙体积的宇宙学 N 体模拟，从而允许在 BAO 尺度上进行宇宙方差有限的预测。我们使用一系列大容量高分辨率模拟来控制数值系统误差的影响。组合分析使我们能够在整个 BAO 范围内测量 $z=0$ 和 $1$ 之间至 1% 的物质功率谱，$0.03<k [\textrm{h Mpc}^{-1}]<0.3$，大小为 $\Delta k/k\lesssim$ 1% 的箱。我们根据非线性演化的无摆动频谱定义 BAO，并确定 BAO 的特征，而无需从全局拟合函数中重复外推。我们量化了非线性对 BAO 极值位置和幅度的影响，以及与功率谱宽带斜率的耦合。我们使用这些估计来测试半解析模型的非线性预测。非常引人注目的是，通过对 BAO 红移演化的分析，我们发现第二个谷值和第三个峰值保持不变，不受非线性效应的影响。此外，我们发现阻尼因子的平方和BAO极值尺度位置的移动可以很好地近似为增长因子的平方，这与微扰理论的预期一致。这证实了这样的想法：除了宇宙距离之外，在不同红移下精确测量 BAO 可以直接探测宇宙结构的生长。
We investigate the non-linear evolution of Baryon Acoustic Oscillations (BAO) in the low-redshift matter power spectrum from the DEUS-FUR $\Lambda$CDM model simulation. This is the first cosmological N-body simulation encompassing the full observable cosmic volume, thus allowing cosmic variance limited predictions at BAO scales. We control the effect of numerical systematic errors using a series of large volume high-resolution simulations. The combined analysis allows us to measure the matter power spectrum between $z=0$ and $1$ to 1% over the entire BAO range, $0.03<k [\textrm{h Mpc}^{-1}]<0.3$, in bins of size $\Delta k/k\lesssim$ 1%. We define the BAO with respect to a non-linearly evolved wiggle-free spectrum and determine the characteristics of the BAO without recurring to extrapolation from global fitting functions. We quantify the effects of non-linearities on the position and amplitude of the BAO extrema, and the coupling to the broadband slope of the power spectrum. We use these estimates to test non-linear predictions from semi-analytical models. Quite remarkably from the analysis of the redshift evolution of BAO we find that the second dip and third peak remains unaltered by non-linear effects. Furthermore, we find that the square of the damping factor and the shift of the position of BAO extrema scale to good approximation as the square of the growth factor, in agreement with expectations from perturbation theory. This confirms the idea that, besides cosmic distances, an accurate measurement of BAO at different redshifts can directly probe the growth of cosmic structures.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.