Gravitational waves from p-form inflation
Gravitational waves from p-form inflation
复制标题
DOI：
10.1088/1475-7516/2009/05/004
复制
发表时间：
2009-03
影响因子：
6.4
通讯作者：
Tsutomu Kobayashi;Shuichiro Yokoyama
中科院分区：
文献类型：
--
作者：
Tsutomu Kobayashi;Shuichiro Yokoyama
最近的研究表明，暴胀背景可以通过任何与引力非最小耦合的p型场来实现。本文研究了p型暴胀过程中产生的引力波。尽管背景演化与传统标量场暴胀中的演化相同，但p型暴胀中引力波的行为却有所不同。特别地，我们发现引力波的传播速度在2-和3-形式的暴胀模型中不同于1。我们指出，在大场模型中，速度的平方变为负值。小场模型没有病态，对引力波频谱的修正结果非常小。
Recently it was shown that an inflationary background can be realized by any p-form field non-minimally coupled to gravity. In this paper, we study gravitational waves generated during p-form inflation. Even though the background evolution is identical to that in conventional scalar field inflation, the behavior of gravitational waves is different in p-form inflation. In particular, we find that the propagation speed of gravitational waves differs from unity in 2- and 3-form inflationary models. We point out that the squared speed becomes negative in the large field models. The small field models are free from pathologies and the correction to the spectrum of gravitational waves turns out to be very small.