论文标题
宇宙学度量扰动的性质，存在重力颗粒的存在
The nature of cosmological metric perturbations in presence of gravitational particle production
论文作者
论文摘要
目前的论文试图回答以下问题：保姆可以吗 辐射存在的阶段是标准的竞争者 早期宇宙的通货膨胀范式？这种DE 保姆阶段可以存在于引力的宇宙学模型中 粒子产生发生。解决问题 在存在辐射的情况下，在De Sitter阶段的扰动必须 已知。公制扰动的演变是明确的 在论文中计算。可以看出 标量和矢量扰动的演变相当大 与标准通货膨胀模型不同。这些差异 由于粒子生产机制而产生。标量 扰动功率谱以较小的长度呈指数增长 秤。但是，一个人不能 独特地指定指数增长的规模 由于功率谱系对初始的依赖性 扰动值。最初的时间切片 扰动开始是任意的。最初的任意性 时间切片与设置初始的问题有关 在本模型中的扰动条件。纸 简要介绍了De Sitter中的向量和张量扰动 充满辐射的空间。可以看出 当前模型中的扰动模式相当大 难的。必须修改当前模型以提供 扰动模式的量化方案一致。
The present paper tries to answer the question: Can a de Sitter phase in presence of radiation be a competitor of the standard inflationary paradigm for the early universe? This kind of a de Sitter phase can exist in cosmological models where gravitational particle production takes place. To address the issue the metric perturbations in the de Sitter phase in presence of radiation must be known. The evolution of metric perturbations are explicitly calculated in the paper. It is seen that the evolution of scalar and vector perturbations are considerably different from standard inflationary models. These differences arise due to the particle production mechanism. The scalar perturbation power spectrum grows exponentially at small length scales. However, one cannot uniquely specify the scale at which this exponential growth starts because of the dependence of the power spectrum on the initial perturbation value. The time slice on which the initial perturbation starts is arbitrary. The arbitrariness of the initial time slice is related to the problem of setting the initial condition on the perturbations in the present model. The paper briefly opines on vector and tensor perturbations in the de Sitter space filled with radiation. It is seen that quantization of the perturbation modes in the present model is considerably difficult. One has to modify the present model to provide a consistent scheme of quantization of the perturbation modes.
