标题： $ω_0 ω_a$CDM 是否是多簇宇宙的良好模型？ 显示英文标题

标题： Is $ω_0 ω_a$CDM a good model for the clumpy Universe?

摘要： DESI合作组刚刚获得了一组精确的BAO测量结果，结合CMB和SNIa数据集表明，$\omega_0 \omega_a$CDM模型比$\Lambda$CDM模型更受青睐，超过$4\,\sigma$，以描述膨胀宇宙的动力学。 这引发了这样一个问题，即该模型是否也能适当描述结构化的宇宙。 最近，对各种宇宙示踪物的详细分析产生了一个新的来自结构化宇宙的可观测量的数据集：$\sigma_8(z)$，覆盖了高红移数据$z \in [0.013, 3.8]$。 在本工作中，我们使用这个包含15$\sigma_8(z_i)$测量值的数据集来研究$\omega_0 \omega_a$CDM宇宙学模型解释结构化宇宙的可行性。 我们的分析将$\omega_0 \omega_a$CDM 模型与使用高斯过程从数据点重构的$\sigma_8(z)$函数进行比较。 此外，我们还对$\Lambda$CDM 模型进行了类似的评估，考虑了普朗克和~DESI 最佳拟合参数。 另外，我们实施了关于高斯过程重构的稳健性测试，以支持我们的结果。 显示英文摘要

摘要： The DESI collaboration just obtained a set of precise BAO measurements, that combined with CMB and SNIa datasets show that the $\omega_0 \omega_a$CDM model is preferred over $\Lambda$CDM, at more than $4\,\sigma$, to describe the dynamics of the expanding Universe. This raises the question whether this model also suitably describes the clumpy Universe. Also lately, detailed analyses of diverse cosmic tracers resulted in a new dataset of measurements of an observable from the clumpy Universe: $\sigma_8(z)$, spanning a high-redshift data $z \in [0.013, 3.8]$. In this work we use this dataset of 15 $\sigma_8(z_i)$ measurements to study the viability of the $\omega_0 \omega_a$CDM cosmological model to explain the clustered Universe. Our analyses compare the $\omega_0 \omega_a$CDM model with the $\sigma_8(z)$ function reconstructed from the data points using Gaussian Process. Moreover, we perform a similar evaluation of the $\Lambda$CDM model considering Planck and~DESI best-fit parameters. In addition, we implemented robustness tests regarding Gaussian Process reconstruction to support our results.