Inflation and primordial non-Gaussianities of 'generalized Galileons'
Inflation and primordial non-Gaussianities of 'generalized Galileons'
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DOI：
10.1088/1475-7516/2011/12/019
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发表时间：
2011-07
影响因子：
6.4
通讯作者：
Xian Gao;D. Steer
中科院分区：
文献类型：
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作者：
Xian Gao;D. Steer
我们建立了宇宙学微扰理论，并研究了[6, 7]中提出的所谓“广义伽利略”的宇宙学含义。这是最一般的标量场理论，其拉格朗日包含高达二阶的导数，同时保持二阶运动方程，并且包含 k-暴胀、G-暴胀和许多其他模型作为子情况。我们计算了原初曲率扰动的功率谱，找到了 k 膨胀或完美流体模型中张量与标量比的通常一致性关系的修改。最后我们还计算了双谱，它不包含除了 k 膨胀之外的新形状。
We set up cosmological perturbation theory and study the cosmological implications of the so-called "generalized Galileon" developed in [6, 7]. This is the most general scalar field theory whose Lagrangian contains derivatives up to second order while keeping second order equations of motion, and contains as sub-cases k-inflation, G-inflation and many other models. We calculate the power spectrum of the primordial curvature perturbation, finding a modification of the usual consistency relation of the tensor-to-scalar ratio in k-inflation or perfect fluid models. Finally we also calculate the bispectrum, which contains no new shapes beyond those of k-inflation.