标题： 相互作用真空中的扰动 显示英文标题

标题： Perturbations in the interacting vacuum

摘要： 在本研究中，我们展示了由标准物质和相互作用真空组成的宇宙中的宇宙扰动演化。我们使用$1 + 3$协变形式化方法在扰动框架中，并考虑了两种不同的相互作用真空模型，即线性相互作用模型和具有生成压力的相互作用模型。对于这两种模型，我们推导了辐射主导和尘埃主导宇宙中线性扰动增长的演化方程。我们在适当的极限情况下找到数值解，即长波长和短波长。对于这两种模型，扰动随时间增长（随红移衰减），表明在加速的宇宙背景中可以形成结构。扰动幅度及其相对于宇宙学标准模型的相对标度取决于所考虑的相互作用参数的值，并且以可用于利用现有和未来大尺度结构数据约束模型的方式。在相互作用耦合参数消失的极限下，我们证明了标准宇宙学，包括背景和扰动，都被恢复。 显示英文摘要

摘要： 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.