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arXiv 1608.06540gr-qcastro-ph.COhep-th
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由宇宙拓扑缺陷激发的纯动力学k-本质的状态方程

An equation of state for purely kinetic k-essence inspired by cosmic topological defects

Ruben Cordero, Eduardo L. Gonzalez, Alfonso Queijeiro

摘要:

我们研究了一个纯动力学k-本质模型的物理性质,该模型具有超导膜中激发的状态方程。我们计算了状态方程参数$w$,并通过非线性状态方程讨论了它的物理演化。利用绝热的声速和能量密度,我们限制了模型的参数范围,以便具有可接受的物理行为。此外,我们还分析了光度距离$d_{L}$随红移$z$的演化,并与$Λ$ CDM模型进行了比较(归一化)。由于状态参数的方程是$z$依赖的光度距离的演变也分析了使用Alcock-Paczyrobski测试。

英文摘要:

We investigate the physical properties of a purely kinetic k-essence model with an equation of state motivated in superconducting membranes. We compute the equation of state parameter $w$ and discuss its physical evolution via a nonlinear equation of state. Using the adiabatic speed of sound and energy density, we restrict the range of parameters of the model in order to have an acceptable physical behavior. Furthermore, we analyze the evolution of the luminosity distance $d_{L}$ with redshift $z$ by comparing (normalizing) it with the $Λ$CDM model. Since the equation of state parameter is $z$-dependent the evolution of the luminosity distance is also analyzed using the Alcock-Paczyński test.

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