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arXiv 1102.5343hep-thastro-ph.COhep-ph
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等边非高斯性与地平线上的新物理

Equilateral Non-Gaussianity and New Physics on the Horizon

Daniel Baumann, Daniel Green

摘要:

我们研究了标量微扰以小声速传播的极限中的单场暴胀的有效理论。在这种情况下,拉格朗日量的非线性实现的时间平移对称性意味着大的相互作用,从而产生原始的非高斯性。当非高斯性是可测量的,这些相互作用将变得强耦合,除非新的物理出现接近哈勃尺度。由于它接近哈勃尺度,新物理不一定与暴胀观测脱钩,并可能影响模型的预测。为了理解可能出现的修正类型,我们构造了弱耦合的理论完备化,并研究了它们的观测特征。

英文摘要:

We examine the effective theory of single-field inflation in the limit where the scalar perturbations propagate with a small speed of sound. In this case the non-linearly realized time-translation symmetry of the Lagrangian implies large interactions, giving rise to primordial non-Gaussianities. When the non-Gaussianities are measurable, these interactions will become strongly coupled unless new physics appears close to the Hubble scale. Due to its proximity to the Hubble scale, the new physics is not necessarily decoupled from inflationary observables and can potentially affect the predictions of the model. To understand the types of corrections that may arise, we construct weakly-coupled completions of the theory and study their observational signatures.

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