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arXiv 0812.1409astro-ph
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小伽马时的暴胀预测

Inflationary predictions at small gamma

Ewa Czuchry

摘要:

本文研究了具有常数但任意声速c_s的单场暴胀模型,通过将动能项变形为狄拉克-玻恩-因菲尔德形式得到。允许c_s<1提供了非高斯性的简单参数化。在首阶慢滚近似下考虑了暴胀观测量对参数cs的依赖性。结果表明,在大多数情况下,对非高斯性的现有界所允许的c_s范围的依赖性实际上是相当弱的。

英文摘要:

This paper explores single field inflation models with a constant, but arbitrary speed of sound c_s, obtained by deforming the kinetic energy terms to a Dirac-Born-Infeld form. Allowing c_s<1 provides a simple parameterization of non-gaussianity. The dependence of inflationary observables on the parameter c_s is considered in the leading order slow roll approximation. The results show that in most cases the dependence is actually rather weak for the range of c_s allowed by existing bounds on non-gaussianity.

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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