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arXiv 2201.08400astro-ph.CO
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PT挑战:在大体积、高分辨率模拟上确认ShapeFit

PT challenge: Validation of ShapeFit on large-volume, high-resolution mocks

Samuel Brieden, Héctor Gil-Marín, Licia Verde

摘要:

ShapeFit压缩方法已被证明是一个强大的工具,以获得宇宙学信息的星系功率谱在一个有效的,模型无关的方式。在这里,我们介绍了其在[1]中提供的盲态PT挑战模拟产品上的性能。选择一个类似于其他参与者的设盲挑战的设置,我们获得了$Δ\ln\left(10^{10} A_s\right) = -0.018 \pm 0.014$、$ΔΩ_\mathrm{m} = 0.0039 \pm 0.0021$和$Δh =-0.0009 \pm 0.0034$,对于$566 \left[ h^{-1}\mathrm{Gpc}\right]^3$的体积,保持低于$2σ$偏差。这相当于未来星系巡天探测到的体积的10倍。我们还提出了一个分析,这些模拟面向实际的数据分析,使用完整的红移演变,使用所有三个红移箱$z_1 = 0.38$,$z_2=0.51$和$z_3 = 0.61$,并探索不同的设置,以量化选择或假设对噪声,偏差,尺度范围等的影响。绘制成团的红移演化有助于将宇宙学参数限制在给定的模型内。

英文摘要:

The ShapeFit compression method has been shown to be a powerful tool to gain cosmological information from galaxy power spectra in an effective, model-independent way. Here we present its performance on the blind PT challenge mock products presented in [1]. Choosing a set-up similar to that of other participants to the blind challenge we obtained $Δ\ln\left(10^{10} A_s\right) = -0.018 \pm 0.014$, $ΔΩ_\mathrm{m} = 0.0039 \pm 0.0021$ and $Δh =-0.0009 \pm 0.0034$, remaining below $2σ$ deviations for a volume of $566 \left[ h^{-1}\mathrm{Gpc}\right]^3$. This corresponds to a volume 10 times larger than the volume probed by future galaxy surveys. We also present an analysis of these mocks oriented towards an actual data analysis using the full redshift evolution, using all three redshift bins $z_1 = 0.38$, $z_2=0.51$, and $z_3 = 0.61$, and exploring different set-ups to quantify the impact of choices or assumptions on noise, bias, scale range, etc. We find consistency across reasonable changes in set-up and across redshifts and that, as expected, mapping the redshift evolution of clustering helps constraining cosmological parameters within a given model.

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