从宇宙学模拟中模拟莱曼-阿尔法森林一维功率谱:来自eBOSS测量的新模型和约束

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Michael Walther, Nils Schöneberg, Solène Chabanier, Eric Armengaud, Jean Sexton, Christophe Yèche, Julien Lesgourgues, Markus R. Mosbech, Corentin Ravoux, Nathalie Palanque-Delabrouille and Zarija Lukić
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引用次数: 0

摘要

我们提出了Lyssa套件的Lyman-α森林的高分辨率宇宙学模拟,设计用于宇宙学分析。这18次模拟使用Nyx代码在120 Mpc (~ 81 Mpc/h)的移动箱中运行40963个流体动力单元,分别提供了Lyman-α森林一维通量功率谱的亚百分比收敛。我们在ly1d似然框架中为Lyssa模拟构建了一个高斯过程仿真器,以插值任意参数值下的功率谱。我们基于leave- out测试和基于训练集外模拟的参数约束来验证该仿真器。我们还与先前的模拟器进行了比较,显示出百分之一级别的精度和预期的宇宙学参数的良好恢复。利用该仿真器推导了线性物质功率谱振幅和斜率参数ALyα和nLyα的约束条件。最拟合的Planck ΛCDM模型alay α = 8.79, nLyα = -2.363,而从DR14 eBOSS数据中我们发现alay α < 7.6 (95% CI), nLyα = -2.369±0.008。Lyman-α森林的平均透射率与Lyman-α森林的平均透射率相关,导致了Lyman α与Planck之间的张力关系。当对平均传输施加一个动机良好的外部先验时,这种张力消失,在这种情况下,我们发现ALyα = 9.8±1.1符合普朗克。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Emulating the Lyman-Alpha forest 1D power spectrum from cosmological simulations: new models and constraints from the eBOSS measurement
We present the Lyssa suite of high-resolution cosmological simulations of the Lyman-α forest designed for cosmological analyses. These 18 simulations have been run using the Nyx code with 40963 hydrodynamical cells in a 120 Mpc (∼ 81 Mpc/h) comoving box and individually provide sub-percent level convergence of the Lyman-α forest 1d flux power spectrum. We build a Gaussian process emulator for the Lyssa simulations in the lym1d likelihood framework to interpolate the power spectrum at arbitrary parameter values. We validate this emulator based on leave-one-out tests and based on the parameter constraints for simulations outside of the training set. We also perform comparisons with a previous emulator, showing a percent level accuracy and a good recovery of the expected cosmological parameters. Using this emulator we derive constraints on the linear matter power spectrum amplitude and slope parameters ALyα and nLyα. While the best-fit Planck ΛCDM model has ALyα = 8.79 and nLyα = -2.363, from DR14 eBOSS data we find that ALyα < 7.6 (95% CI) and nLyα = -2.369 ± 0.008. The low value of ALyα, in tension with Planck, is driven by the correlation of this parameter with the mean transmission of the Lyman-α forest. This tension disappears when imposing a well-motivated external prior on this mean transmission, in which case we find ALyα = 9.8 ± 1.1 in accordance with Planck.
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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