标题： 宇宙学空洞的球形流体动力学模型在ΛCDM及之外的情况 显示英文标题

标题： A spherical hydrodynamical model of cosmic voids in ΛCDM and beyond

摘要： 宇宙空洞已成为宇宙学的强大探针，提供了关于宇宙大尺度结构的补充信息。 我们介绍了首次将流体动力学框架应用于模拟宇宙空洞演化的应用。 这种方法提供了对空洞动力学的物理直观描述，并可以自然地应用于非标准宇宙学。 我们推导了与宇宙学相关的映射关系，该关系将物质密度对比的线性（拉格朗日）和完全非线性（欧拉）演化联系起来，这是准确理论建模空洞统计的关键组成部分。 此外，我们提出了一种新的方法，在任意宇宙学背景下确定交叉壳层时期，从而扩展了之前仅限于爱因斯坦-德西特宇宙的处理方法。 受最近DESI结果暗示动态暗能量的启发，我们通过改变$ w_0w_a$和$ w_0$来研究$w_a$CDM 宇宙学中的空洞演化。 我们还考虑了改变物质密度参数$ \Omega_{\mathrm{m},0}$的影响。 我们发现，孤立的、球对称的宇宙空洞的演化最敏感于$ \Omega_{\mathrm{m},0} $和$ w_0 $，它们可以使非线性密度对比度变化高达20-30%。 $w_a$的变化影响较小，但仍然可能导致可测量的效果。 我们还表明，线性与非线性密度对比度之间的宇宙学依赖映射可能为精确空洞分析中的动态暗能量提供敏感的探测手段。 显示英文摘要

摘要： Cosmic voids have emerged as powerful probes for cosmology, providing complementary information on the large-scale structure of the universe. We present the first application of a hydrodynamical framework to model the evolution of cosmic voids. This approach offers a physically intuitive characterization of void dynamics and can naturally be applied to non-standard cosmologies. We derive the cosmology-dependent mapping that relates the linear (Lagrangian) and fully non-linear (Eulerian) evolution of the matter density contrast, a central component for accurate theoretical modeling of void statistics. Furthermore, we present a new method for determining the shell-crossing epoch across arbitrary cosmological backgrounds, thereby extending previous treatments restricted to the Einstein-de Sitter universe. Motivated by recent DESI results hinting at dynamical dark energy, we investigate void evolution in $ w_0w_a$CDM cosmologies by varying $ w_0$ and $w_a$. We also consider the impact of varying the matter density parameter, $ \Omega_{\mathrm{m},0}$. We find that the evolution of isolated, spherically symmetric cosmic voids is most sensitive to $ \Omega_{\mathrm{m},0} $ and $ w_0 $, which can alter the non-linear density contrast by up to 20-30%. Variations in $w_a$ have a smaller impact, but may still lead to measurable effects. We also show that the cosmology-dependent mapping between linear and non-linear density contrasts may provide a sensitive probe of dynamical dark energy in precision void analyses.