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arXiv 0806.1016astro-phgr-qchep-th
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宇宙学扰动的Action方法:物质占优的二阶度规

Action approach to cosmological perturbations: the 2nd order metric in matter dominance

Lotfi Boubekeur, Paolo Creminelli, Jorge Norena, Filippo Vernizzi

摘要:

利用理想正压流体与具有拉格朗日量[-(\partial导数)^2]^[(1+w)/2 w]的导数耦合标量场之间的等价性,研究了后暴胀演化过程中的非线性宇宙学扰动.由于这个拉格朗日量只是k-暴胀的一个特例,这种方法类似于从暴胀研究非高斯性的方法。我们使用这种方法直接推导出随动规范中物质占主导地位期间的二阶度规,作为原始暴胀微扰ζ的函数。转到泊松规范,我们恢复以前在文献中导出的度量。

英文摘要:

We study nonlinear cosmological perturbations during the post-inflationary evolution, using the equivalence between a perfect barotropic fluid and a derivatively coupled scalar field with Lagrangian [-(\partial ϕ)^2]^[(1+w)/2w]. Since this Lagrangian is just a special case of k-inflation, this approach is analogous to the one employed in the study of non-Gaussianities from inflation. We use this method to derive the second order metric during matter dominance in the comoving gauge directly as function of the primordial inflationary perturbation ζ. Going to Poisson gauge, we recover the metric previously derived in the literature.

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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