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arXiv 0909.5167hep-thastro-ph.COgr-qchep-ph
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Horava-Lifshitz宇宙学中的标量场扰动

Scalar field perturbations in Horava-Lifshitz cosmology

Anzhong Wang, David Wands, Roy Maartens

摘要:

本文研究了Horava-Lifshitz引力中标量场宇宙学的扰动,采用了最一般的设置,没有细致平衡,但具有可投射性条件。我们推导出广义Klein-Gordon方程,它是六阶空间导数。然后,我们研究了平坦背景中与引力耦合的标量场扰动。在亚视界区,度规场和标量场模式具有独立的振荡,除了特殊情况外,它们具有不同的频率和相位。在超视界尺度上,由单场驱动的慢卷暴胀过程中,扰动变为绝热的,并且同动曲率扰动是常数。

英文摘要:

We study perturbations of a scalar field cosmology in Horava-Lifshitz gravity, adopting the most general setup without detailed balance but with the projectability condition. We derive the generalized Klein-Gordon equation, which is sixth-order in spatial derivatives. Then we investigate scalar field perturbations coupled to gravity in a flat Friedmann-Robertson-Walker background. In the sub-horizon regime, the metric and scalar field modes have independent oscillations with different frequencies and phases except in particular cases. On super-horizon scales, the perturbations become adiabatic during slow-roll inflation driven by a single field, and the comoving curvature perturbation is constant.

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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