论文标题
相互作用真空的扰动
Perturbations in the interacting vacuum
论文作者
论文摘要
在这项研究中，我们介绍了由标准物质和相互作用真空组成的宇宙中宇宙学扰动的演变。我们在扰动框架中使用$ 1 + 3 $协变形式主义，并考虑了两种不同的模型，用于交互真空，即线性相互作用模型以及与Creation压力模型的相互作用。对于这两个模型，我们得出了控制辐射和尘埃占主导宇宙的线性扰动生长的演化方程。我们发现数值溶液在适当的限制中，即长波长和短波长。对于这两种模型，扰动随时间增长（随着红移的衰减），表明在加速的宇宙背景中可能形成结构。摄动振幅及其相对尺度与标准模型的宇宙学模型取决于所考虑的交互参数的值，并以可用于使用现有和未来的大型结构数据来限制模型的方式。在相互作用的耦合参数的消失限制中，我们表明恢复了背景和扰动的标准宇宙学。
In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the $1 + 3$ covariant formalism in perturbation framework and consider two different models for the interacting vacuum namely a linear interacting model and interaction with creation pressure model. For both models, we derive the evolution equations governing the growth of linear perturbations for both radiation and dust dominated Universe. We find numerical solutions in appropriate limits namely long and short wavelengths. For both models, the perturbations grow with time (decay with redshift), showing that structure formation is possible in an accelerated cosmic background. The perturbation amplitudes and their relative scalings with those of standard model of cosmology depend on the values of the interaction parameters considered, and in a way that can be used to constrain the models using existing and future large scale structure data. In the vanishing limits of the coupling parameters of the interaction, we show that standard cosmology, both background and perturbed, is recovered.
