论文标题
Lyman- $α$ forest Flux Power Spectrum的多余模拟器
A Multi-Fidelity Emulator for the Lyman-$α$ Forest Flux Power Spectrum
论文作者
论文摘要
在这项工作中，我们将最近开发的多保真仿真技术扩展到模拟的Lyman-$α$森林通量功率谱。多保真仿真允许使用许多廉价的低保真模拟和一些昂贵的高保真模拟在宇宙学参数之间插值。使用小盒子（30 mpc/h）模拟的测试套件，我们表明多保真仿真能够很好地复制Lyman-$α$ forest通量功率谱，与$ 0.8 \％的测试套件相比，达到了平均准确性。我们进一步表明，仅使用高保真模拟构建，它比单性模拟器具有大幅提高的精度。特别是，它允许将现有模拟套件扩展到较小的尺度和更高的红移。
In this work we extend our recently developed multi-fidelity emulation technique to the simulated Lyman-$α$ forest flux power spectrum. Multi-fidelity emulation allows interpolation of simulation outputs between cosmological parameters using many cheap low-fidelity simulations and a few expensive high-fidelity simulations. Using a test suite of small box (30 Mpc/h) simulations, we show that multi-fidelity emulation is able to reproduce the Lyman-$α$ forest flux power spectrum well, achieving an average accuracy when compared to a test suite of $0.8\%$. We further show that it has a substantially increased accuracy over single-fidelity emulators, constructed using either the high or low-fidelity simulations only. In particular, it allows the extension of an existing simulation suite to smaller scales and higher redshifts.
