论文标题
通货膨胀双胞胎模型
Inflationary Twin Models
论文作者
论文摘要
我们介绍了通货膨胀双胞胎模型的概念，即一类广义（动力学或“ k通货膨胀”）田间理论，这些理论完全导致通货膨胀期间与给定标准标量膨胀理论相同的宇宙学演化。双胞胎概念允许以受控的方式引入广义的K通货膨胀理论，从而保持一些通货膨胀的预测。此外，这个概念可以将诸如慢速扩展（慢速扩展）等分析工具扩展到k通知理论的领域，从而促进他们的研究。由于声音的非平凡标量速度，标准标量膨胀模型的双胞胎仍然可能导致某些通货膨胀可观察到的结果不同。这意味着非标准的双胞胎可能会导致通货膨胀的完全可行的模型，即使观察结果排除了标准双胞胎。我们提供了这种可能性的明确例子，包括Dilaton-Dirac-Born-thefeld理论的物理情况。
We introduce the concept of inflationary twin models, that is, a class of generalized (kinetic or "K-inflation") field theories which lead exactly to the same cosmological evolution during the inflationary period as a given standard scalar field theory of inflation. The twin concept permits to introduce generalized, K-inflation theories in a controlled manner, maintaining some inflationary predictions unaltered. Further, this concept allows to extend analytical tools like the slow-roll expansion to the realm of K-inflation theories, facilitating their investigation. Twins of a standard scalar field model of inflation still may result in different results for some inflationary observables, because of their nontrivial scalar speed of sound. This implies that non-standard twins may lead to completely viable models of inflation, even if their standard twin is ruled out by observations. We provide some explicit examples of this possibility, including the physical case of a dilaton--Dirac-Born-Infeld theory.
