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arXiv 1708.04262hep-thgr-qc
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广义Galileon理论中的扰动

Perturbations in generalized Galileon theories

R. Kolevatov, S. Mironov, V. Rubakov, N. Sukhov, V. Volkova

摘要:

本文讨论了Deffayet等人(DPSV)和Kobayashi等人(KYY)在Horndeski理论中分析空间平坦FLRW背景的线性化标量扰动的方法。我们确定额外的,潜在的重要条款在DPSV的方法。然而,这些条款消失后,一个明智的衡量选择。我们推导出一个规范不变的二次行动的度量和Galileon扰动的$\mathcal{L}_3$和$\mathcal{L}_3+\mathcal{L}_4$理论,并表明在DPSV和KYY方法获得的行动遵循从这个规范不变的行动在特定的规范。

英文摘要:

We discuss the approaches by Deffayet et al. (DPSV) and Kobayashi et al. (KYY) to the analysis of linearized scalar perturbations about a spatially flat FLRW background in Horndeski theory. We identify additional, potentially important terms in the DPSV approach. However, these terms vanish upon a judicious gauge choice. We derive a gauge invariant quadratic action for metric and Galileon perturbations in $\mathcal{L}_3$ and $\mathcal{L}_3+\mathcal{L}_4$ theories and show that actions obtained in the DPSV and KYY approaches follow from this gauge invariant action in particular gauges.

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