论文标题
百分比的Sigma-8：真实空间中的EFT可能性
Sigma-Eight at the Percent Level: The EFT Likelihood in Real Space
论文作者
论文摘要
有偏见示踪剂密度场的有效场理论可能会从星系的聚类中推断出宇宙学的推断，这些星系的聚类始终在扰动理论中以给定的顺序使用所有可用信息。本文介绍了结果和实施细节，以实现真实空间（而不是傅立叶空间）的可能性，从而允许合并调查窗口功能。该实施进一步使用了偏见的示踪剂的拉格朗日前向前进模型，该模型会自动说明所有相关贡献到任何所需的订单。 $σ_8$的公正推理在2％的级别上显示了截止值$λ\ leq 0.14H \，{\ rm mpc}^{ - 1} $，用于halo样品在一系列质量和红移中。推断的值显示了低点限制中与地面真相的预期收敛。除了包括观察效应的可能性外，这还代表了基于EFT可能性的先前结果的实质性改善。
The effective field theory likelihood for the density field of biased tracers allows for cosmology inference from the clustering of galaxies that consistently uses all available information at a given order in perturbation theory. This paper presents results and implementation details on the real-space (as opposed to Fourier-space) formulation of the likelihood, which allows for the incorporation of survey window functions. The implementation further uses a Lagrangian forward model for biased tracers which automatically accounts for all relevant contributions up to any desired order. Unbiased inference of $σ_8$ is demonstrated at the 2% level for cutoff values $Λ\leq 0.14h\,{\rm Mpc}^{-1}$ for halo samples over a range of masses and redshifts. The inferred value shows the expected convergence to the ground truth in the low-cutoff limit. Apart from the possibility of including observational effects, this represents further substantial improvement over previous results based on the EFT likelihood.
