米拉-泰坦宇宙II：物质功率谱仿真
The Mira-Titan Universe II: Matter Power Spectrum Emulation
摘要：
我们介绍了一个新的宇宙模拟器的物质功率谱覆盖八个宇宙学参数。针对光学巡天，该模拟器提供了波数k~5/Mpc和红移z ≤ 2的精确预测。除了涵盖标准的LCDM参数集，大量的中微子和动态的暗能量的状态。模拟器是建立在一个样本集的36个宇宙学模型，精心挑选，以提供准确的预测在广泛和大的参数空间。对于每个模型，我们都进行了高分辨率模拟，并增加了16个中等分辨率模拟和TimeRG微扰理论结果，以提供广泛k范围的准确覆盖;作为该项目的一部分，生成的数据集超过1.2Pbyte。使用当前的模拟模型集，我们实现了约4%的准确度。由于这里使用的采样方法已经建立了收敛和误差控制特性，后续的结果与100多个宇宙学模型将很快达到~1%的精度。我们比较我们的方法与其他预测方案的基础上晕模型的想法和重新映射的方法。新的模拟器代码是公开的。
英文摘要：
We introduce a new cosmic emulator for the matter power spectrum covering eight cosmological parameters. Targeted at optical surveys, the emulator provides accurate predictions out to a wavenumber k~5/Mpc and redshift z<=2. Besides covering the standard set of LCDM parameters, massive neutrinos and a dynamical dark energy of state are included. The emulator is built on a sample set of 36 cosmological models, carefully chosen to provide accurate predictions over the wide and large parameter space. For each model, we have performed a high-resolution simulation, augmented with sixteen medium-resolution simulations and TimeRG perturbation theory results to provide accurate coverage of a wide k-range; the dataset generated as part of this project is more than 1.2Pbyte. With the current set of simulated models, we achieve an accuracy of approximately 4%. Because the sampling approach used here has established convergence and error-control properties, follow-on results with more than a hundred cosmological models will soon achieve ~1% accuracy. We compare our approach with other prediction schemes that are based on halo model ideas and remapping approaches. The new emulator code is publicly available.
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