arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2405.10312astro-ph.CO
收藏

KiDS-1000与DES-Y1联合:基于峰值计数统计的宇宙学

KiDS-1000 and DES-Y1 combined: Cosmology from peak count statistics

Joachim Harnois-Deraps, Sven Heydenreich, Benjamin Giblin, Nicolas Martinet, Tilman Troester, Marika Asgari, Pierre Burger, Tiago Castro, Klaus Dolag, Catherine… 展开作者

Joachim Harnois-Deraps, Sven Heydenreich, Benjamin Giblin, Nicolas Martinet, Tilman Troester, Marika Asgari, Pierre Burger, Tiago Castro, Klaus Dolag, Catherine Heymans, Hendrik Hildebrandt, Benjamin Joachimi, Angus H. Wright

AI总结:

本文利用KiDS-1000和DES-Y1的宇宙剪切峰值计数统计,结合基于模拟的推断,在$w$CDM框架下联合约束结构增长参数$Σ_8$,得到迄今最严格约束之一,并量化了与Planck结果的张力。

摘要:

我们分析了千度巡天第四次数据发布(KiDS-1000),并基于宇宙剪切峰值计数统计提取宇宙学参数约束。峰值在孔径质量图中被识别,其中滤波器对角尺度在2-4角分范围内具有最大灵敏度,从而深入探测结构形成的非线性区域。我们使用基于模拟的推断流程解释结果,在较宽的$w$CDM先验体积内采样,并对形状校准、测光红移分布、内禀对齐和重子反馈的不确定性进行边缘化。我们的测量将结构增长参数和非线性内禀对齐模型的幅度分别约束为$Σ_8 \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$和$A_{\rm IA}= 0.71^{+0.42}_{-0.42}$,与先前基于两点剪切统计的KiDS-1000结果一致。这些结果对非线性物理建模、不同尺度截断和层析分箱选择具有稳健性。后验分布也与Harnois-Déraps等人(2021)提出的暗能量巡天第一年峰值计数分析结果一致,因此我们联合分析两项巡天。我们得到$Σ_8^{\rm joint} \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.57}=0.759^{+0.020}_{-0.017}$,与Planck $w$CDM结果一致。当强制$w=-1.0$时,该参数上的剪切-CMB张力增加到$3.1σ$;若改为与$S_{8,Λ{\rm CDM}}^{\rm joint} = 0.736^{+0.016}_{-0.018}$比较,则增加到$4.1σ$,这是迄今为止对该量最严格的约束之一。(节略)

英文摘要:

We analyse the fourth data release of the Kilo Degree Survey (KiDS-1000) and extract cosmological parameter constraints based on the cosmic shear peak count statistics. Peaks are identified in aperture mass maps in which the filter is maximally sensitive to angular scales in the range 2-4arcmin, probing deep into the non-linear regime of structure formation. We interpret our results with a simulation-based inference pipeline, sampling over a broad $w$CDM prior volume and marginalising over uncertainties on shape calibration, photometric redshift distribution, intrinsic alignment and baryonic feedback. Our measurements constrain the structure growth parameter and the amplitude of the non-linear intrinsic alignment model to $Σ_8 \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$ and $A_{\rm IA}= 0.71^{+0.42}_{-0.42}$, respectively, in agreement with previous KiDS-1000 results based on two-point shear statistics. These results are robust against modelling of the non-linear physics, different scale cuts and selections of tomographic bins. The posterior is also consistent with that from the Dark Energy Survey Year-1 peak count analysis presented in Harnois-Déraps et al (2021), and hence we jointly analyse both surveys. We obtain $Σ_8^{\rm joint} \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.57}=0.759^{+0.020}_{-0.017}$, in agreement with the Planck $w$CDM results. The shear-CMB tension on this parameter increases to $3.1σ$ when forcing $w=-1.0$, and to $4.1σ$ if comparing instead with $S_{8,Λ{\rm CDM}}^{\rm joint} = 0.736^{+0.016}_{-0.018}$, one of the tightest constraints to date on this quantity. (abridged)

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑