论文标题
在非平台背景中粒子创造的协变量方法
A Covariant Approach for Particle Creation in Non-flat Background
论文作者
论文摘要
凯林方法用于研究在不同背景空间时间的准清理膨胀期间的粒子产生。在计算创建粒子频谱的常规方法中，背景时空自动被视为平坦。选择平面背景会带来两个基本问题：首先，计算方法不是相对于弯曲时空的协变量。其次，创建的粒子的数量变为负。凯林方法可以被视为一种协变量方法，用于计算弯曲时空中的两点函数。因此，我们在早期宇宙膨胀期间扩展了这种方法来创建粒子。作为一个新建议，我们根据该时空中最少的创建粒子选择背景真空。该计算将表明，要解决上述问题，背景时空必须是非平板，背景中的粒子数必须最小。
Krein approach is used to study the particle creation during quasi-de Sitter inflation in different background space-times. In the conventional method for calculating the created particles spectrum, the background space-time is automatically considered flat. Selecting a flat background poses two fundamental problems: First, the method of calculating is not covariant relative to the curved space-time. Second, the number of created particles becomes negative. Krein approach can be considered as a covariant method to calculate two-point functions in curved space-time. So we extend this method for particle creation during early cosmic inflation. As a new proposal, we choose the background vacuum based on the smallest number of created particles in that space-time. The calculations will show that in order to solve the above mentioned problems, the background space-time must be non-flat and the number of particles in the background must be minimum.
