关于$fσ_8$张力的简并性及其高斯过程预测
On the degeneracy between $fσ_8$ tension and its Gaussian process forecasting
摘要：
本文利用高斯过程的马尔可夫链蒙特卡罗算法重建了宇宙结构的生长和演化。我们估计通过最大化核超参数计算的重建与通过完全探索参数空间获得的重建之间的差异。我们发现，这两种方法之间的差异是$1\%$的顺序。此外，我们将我们的结果与Planck Collaboration 2018假设$Λ$ CDM模型获得的结果进行了比较，并且我们没有发现$fσ_{8}$重建后的红移范围存在统计学显著差异。
英文摘要：
In this paper we reconstruct the growth and evolution of the cosmic structure of the Universe using Markov Chain Monte Carlo algorithms for Gaussian processes [1]. We estimate the difference between the reconstructions that are calculated through a maximization of the kernel hyperparameters and those that are obtained with a complete exploration of the parameter space. We find that the difference between these two approaches is of the order of $1\%$. Furthermore, we compare our results with those obtained by Planck Collaboration 2018 assuming a $Λ$CDM model and we do not find a statistically significant difference in the redshift range were the reconstructions of $fσ_{8}$ have been made.
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