论文标题
幻影宇宙中不同的深色能量有效速度的声音参数
A varying Dark Energy effective speed of sound parameter in the phantom Universe
论文作者
论文摘要
我们分析了声音参数有效的变化速度（$ c^{2} _ {\ textrm {sd}} $，对三种模型的宇宙学扰动。这些模型中的每一个都会引起一个特定的突然未来事件，称为大RIP（BR），Little RIP（LR）和Big Rip（LSBR）的小兄弟姐妹。在这类突然的事件中，宇宙中的所有界结构都将在有限的宇宙时间撕裂。我们计算扰动的演变，$fσ_{8} $增长率并预测当前物质功率谱。我们将$ c^{2} _ {\ textrm {\ textrm {sd}} $参数在间隔$ [0,1] $中，并用尊重$ c^{2} _ {\ textrm {sd}} = 1 $计算相对偏差。此外，我们分析了与当前相比，在非常大规模的因子下发生的引力电位范围的效果。
We analyse the phenomenological effects of a varying Dark Energy (DE) effective speed of sound parameter, $c^{2}_{\textrm{sd}}$, on the cosmological perturbations of three phantom DE models. Each of these models induce a particular abrupt future event known as Big Rip (BR), Little Rip (LR), and Little Sibling of the Big Rip (LSBR). In this class of abrupt events, all the bound structures in the Universe would be ripped apart at a finite cosmic time. We compute the evolution of the perturbations, $fσ_{8}$ growth rate and forecast the current matter power spectrum. We vary the $c^{2}_{\textrm{sd}}$ parameter in the interval $[0,1]$ and compute the relative deviation with respect $c^{2}_{\textrm{sd}}=1$. In addition, we analyse the effect of gravitational potential sign flip that occurs at very large scale factors as compared with the current one.
