论文标题
在充电前时代的物质领域的辐射主导行为的论点
Argument for the radiation-dominated behavior of matter fields in the preinflationary era
论文作者
论文摘要
我们使用半经典近似研究了通货膨胀时代的物质领域的领先行为。许多通货膨胀模型假设不支持争论，即宇宙是在通货膨胀之前占主导地位的辐射，从而导致宇宙学可观察物的改变，例如宇宙微波背景功率谱。在以前的工作中，我们证明了在足够早期的应激能量张量确实具有辐射量的贡献。在这项工作中，我们将这些参数扩展到无质量的旋转-1字段以及巨大或无质量的自旋 - $ \ frac {1} {2} $字段。我们发现无质量的自旋1场总是具有辐射样的贡献。对于旋转 - $ \ frac {1} {2} $ fields，我们发现早期的贡献类似于辐射，假设这是对应力能量张量的主要贡献。
We investigate the leading-order behavior of matter fields in the preinflationary era using the semiclassical approximation. Many inflationary models assume without supporting arguments that the Universe was radiation dominated prior to inflation, leading to modifications of cosmological observables, such as the Cosmic Microwave Background power spectrum. In previous work, we demonstrated that conformally coupled scalar fields do have a radiation-like contribution to the stress-energy tensor at sufficiently early times. In this work, we extend these arguments to apply to massless spin-1 fields and massive or massless spin-$\frac{1}{2}$ fields. We find massless spin-1 fields always have a radiation-like contribution. For spin-$\frac{1}{2}$ fields, we find the contribution at early times is radiation-like assuming this is the dominant contribution to the stress-energy tensor.
