论文标题
关于通货年前时代及其对功率谱的影响的半经典预测
Semiclassical predictions regarding a pre-inflationary era and its effects on the power spectrum
论文作者
论文摘要
在至少一部分半经典重力有效的过程中，对充电前时代的特性和影响进行了研究。有人认为，如果宇宙（或我们的部分）在那个时代大致相同和各向同性，那么宇宙很可能是辐射主导的。一个简单的模型，其中宇宙包含经典的辐射和宇宙常数用于研究这种充电前时代对宇宙微波背景的潜在影响。使用量化的无质量最小耦合标量场的模式函数计算功率谱。考虑了该领域的各种状态选择，包括各种秩序的绝热真空状态和如果宇宙突然从辐射占据主导到DE Sitter空间的真空状态自然会发生。在所有调查的情况下，都会抑制较大角度的功率谱，并且当绘制作为动量参数的函数时，总会有振荡依赖于状态的振幅。
An investigation is undertaken into the properties and effects of a preinflationary era during at least part of which semiclassical gravity was valid. It is argued that if the Universe (or our part of it) was approximately homogeneous and isotropic during that era, then the Universe was likely to have been radiation dominated. A simple model in which the Universe contains classical radiation and a cosmological constant is used to investigate potential effects of such a preinflationary era on the cosmic microwave background. The power spectrum is computed using the mode functions of a quantized massless minimally coupled scalar field. Various choices of state for this field are considered, including adiabatic vacuum states of various orders and the vacuum state that would naturally occur if the Universe made a sudden transition from being radiation dominated to de Sitter space. In all cases investigated, there is a suppression of the power spectrum at large angles, and, when plotted as a function of the momentum parameter, there are always oscillations with state-dependent amplitudes.
