Consistency of effective field theory analyses of the BOSS power spectrum
Consistency of effective field theory analyses of the BOSS power spectrum
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DOI：
10.1103/physrevd.107.123530
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发表时间：
2022-08
影响因子：
5
通讯作者：
T. Simon;Pierre Zhang;V. Poulin;Tristan L. Smith
中科院分区：
文献类型：
--
作者：
T. Simon;Pierre Zhang;V. Poulin;Tristan L. Smith
我们评估的鲁棒性的$\Lambda$CDM的结果从全形状分析BOSS功率谱使用一个循环预测的有效场理论的大规模结构（EFTofLSS）。PyBird和CLASS-PT的公共似然性仅在$1\sigma$水平上导致一致的结果，尽管它们来自相同的BOSS数据集和理论模型。我们对两条管道之间的各种分析选择进行了彻底的比较，并确定差异来自EFT参数的先验选择，称为“西海岸”（WC）和“东海岸”（EC）先验，分别与PyBird和CLASS-PT相关。特别是，因为后验是非高斯的，从边缘化的EFT参数的投影效应转移后验平均值的宇宙学参数相对于最佳拟合高达$1\sigma$在WC之前和高达$2\sigma$在EC之前。我们量化的最佳拟合的宇宙学参数提取的BOSS给定的两个先前的选择是一致的，在$\sim 1\sigma$。当将先前的宽度加倍时，一致性提高到$\sim 0.5\sigma$。虽然这表明，目前的EFT分析受到先前的影响，我们表明，宇宙学的结果与CMB相结合，或从即将到来的大容量数据，这些影响的敏感性较低。此外，我们调查BOSS测量之间的差异。我们发现广泛的协议，在所有考虑（$<0.6\sigma$）重建前的测量，但两个可用的BOSS后重建测量傅立叶空间，一旦结合EFT全形状分析，导致不一致的哈勃参数H_0 $在$\sim 0.9\sigma$。考虑到我们讨论的各种影响，我们认为，集群振幅测量与BOSS是不是在统计张力从普朗克下$\Lambda$CDM推断。
We assess the robustness of $\Lambda$CDM results from the full-shape analysis of BOSS power spectrum using the one-loop prediction of the Effective Field Theory of Large-Scale Structure (EFTofLSS). The public likelihoods PyBird and CLASS-PT lead to results in agreement only at the $1\sigma$ level, despite the fact that they are derived from the same BOSS dataset and theory model. We perform a thorough comparison of the various analyses choices made between the two pipelines, and identify that the differences come from the choice of prior on the EFT parameters, dubbed"West-coast"(WC) and"East-coast"(EC) prior, respectively associated to PyBird and CLASS-PT. In particular, because posteriors are non-Gaussian, projection effects from the marginalization over the EFT parameters shift the posterior mean of the cosmological parameters with respect to the best-fit up to $1\sigma$ in the WC prior and up to $2\sigma$ in the EC prior. We quantify that best-fit cosmological parameters extracted from BOSS given the two prior choices are consistent at $\sim 1\sigma$. The consistency improves to $\sim 0.5\sigma$ when doubling the prior widths. While this reveals that current EFT analyses are subject to prior effects, we show that cosmological results obtained in combination with CMB, or from forthcoming large-volume data, are less sensitive to those effects. In addition, we investigate differences between BOSS measurements. We find broad agreements across all pre-reconstructed measurements considered ($<0.6\sigma$), but the two available BOSS post-reconstructed measurements in Fourier space, once combined with the EFT full-shape analysis, lead to discrepant Hubble parameter $H_0$ at $\sim 0.9\sigma$. Given the various effects we discuss, we argue that the clustering amplitude $\sigma_8$ measured with BOSS is not in statistical tension with that inferred from Planck under $\Lambda$CDM.