The Mira-Titan Universe. II. Matter Power Spectrum Emulation
The Mira-Titan Universe. II. Matter Power Spectrum Emulation
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DOI：
10.3847/1538-4357/aa86a9
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
E. Lawrence;K. Heitmann;J. Kwan;A. Upadhye;D. Bingham;S. Habib;D. Higdon;A. Pope;H. Finkel;N. Frontiere
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文献类型：
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作者：
E. Lawrence;K. Heitmann;J. Kwan;A. Upadhye;D. Bingham;S. Habib;D. Higdon;A. Pope;H. Finkel;N. Frontiere
我们介绍了一个新的覆盖八个宇宙学参数的物质功率谱宇宙模拟器。该模拟器以光学测量为目标，向波数MPC−1和红移提供准确的预测。除了涵盖标准的Λ清洁发展机制参数集，还包括质量中微子和动态暗能量状态。该模拟器建立在36个宇宙学模型的样本集上，这些模型经过精心挑选，以在广泛和大的参数空间内提供准确的预测。对于每个模型，我们都执行了高分辨率模拟，并增加了16个中分辨率模拟和TimeRG扰动理论结果，以在宽k范围内提供准确的覆盖；作为该项目的一部分产生的数据集超过1.2P字节。用目前的一套模拟模型，我们达到了大约4%的精度。由于这里使用的抽样方法已经建立了收敛和误差控制的性质，用一百多个宇宙模型进行的后续结果很快就会达到精度。我们将我们的方法与其他基于光晕模型思想和重映射方法的预测方案进行了比较。新的仿真器代码是公开可用的。
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 Mpc−1 and redshift . In addition to covering the standard set of ΛCDM 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 16 medium-resolution simulations and TimeRG perturbation theory results to provide accurate coverage over a wide k-range; the data set generated as part of this project is more than 1.2Pbytes. 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-up results with more than a hundred cosmological models will soon achieve 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.