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arXiv 0903.2769astro-ph.COgr-qchep-th
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p型暴胀的引力波

Gravitational waves from p-form inflation

Tsutomu Kobayashi, Shuichiro Yokoyama

摘要:

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$p$形式的场来实现。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的标量场暴胀完全相同,但在p型暴胀中,引力波的行为是不同的。特别地,我们发现引力波的传播速度在2-和3-形式暴胀模型中不同于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,对引力波谱的修正也很小。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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