论文标题
在有任意音速的暗能有的情况下，非顶帽轮廓的球形崩溃
Spherical collapse of non-top-hat profiles in the presence of dark energy with arbitrary sound speed
论文作者
论文摘要
我们研究了具有任意声速的暗能量存在的非顶帽物质波动的球形崩溃。该模型由使用带有搭配点的伪谱法求解的部分微分方程系统来描述。该方法可以在线性式中重现已知的分析解决方案，其精度优于$ 10^{ - 6} \％$，并且比通常的螺旋倒塌模型给出的病毒化阈值大于$ 10^{ - 2} \％$。我们显示了非线性暗能量波动对物质曲线，物质奇特速度和重力潜力的影响。我们还表明，具有低音速的幻影深色能模型可以在物质光晕周围发展病理行为，即负能量密度。还计算了病毒化阈值密度对塌陷的依赖性，也计算出深色能声速度，并确认并扩展了以前的结果，以均质和聚类的暗能量的限制。
We study the spherical collapse of non-top-hat matter fluctuations in the presence of dark energy with arbitrary sound speed. The model is described by a system of partial differential equations solved using a pseudo-spectral method with collocation points. This method can reproduce the known analytical solutions in the linear regime with an accuracy better than $10^{-6}\%$ and better than $10^{-2}\%$ for the virialization threshold given by the usual spherical collapse model. We show the impact of nonlinear dark energy fluctuations on matter profiles, matter peculiar velocity and gravitational potential. We also show that phantom dark energy models with low sound speed can develop a pathological behaviour around matter halos, namely negative energy density. The dependence of the virialization threshold density for collapse on the dark energy sound speed is also computed, confirming and extending previous results in the limit for homogeneous and clustering dark energy.
