Non-Gaussianities in models with a varying inflaton decay rate
Non-Gaussianities in models with a varying inflaton decay rate
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具有不同暴胀衰减率的模型中的非高斯性
DOI：
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发表时间：
2003
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通讯作者：
M. Zaldarriaga
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文献类型：
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作者：
M. Zaldarriaga
我们考虑模型中原始非高斯性的预期水平，其中密度扰动是由暴胀衰减率的空间波动产生的。我们考虑由控制衰减率的场的自耦合以及场和曲率扰动之间的非线性关系产生的非高斯性。我们证明，在这些场景中，非高斯性具有“局部”形式，这可以通过 ansatz R =Rg + f_{NL} (Rg^2 - ) 得到很好的描述。这是因为它们是在模态已经在地平线之外时创建的。我们表明，在这些模型中，f_{NL} 自然是几阶的，远大于标准膨胀场模型 (f_{NL}\sim 10^{-2}) 中的预期值，并且可能可以进行观测。
We consider the expected level of primordial non-Gaussianities in models in which density perturbations are produced by spatial fluctuations in the decay rate of the inflaton. We consider both the non-Gaussianities resulting from the self-couplings of the field that controls the decay rate as well as from the non-linear relation between field and curvature perturbations. We show that in these scenario non-Gaussianities are of the "local" form, that is well described be the ansatz R =Rg + f_{NL} (Rg^2 - ). This is a consequence of the fact that they were created when modes were already outside the horizon. We show that f_{NL} is naturally of order a few in these models, much larger than what is expected in the standard one field models of inflation (f_{NL}\sim 10^{-2}) and possibly accessible to observations.