δN公式是动力学重整化群
The δN formula is the dynamical renormalization group
摘要：
我们直接从场论计算出发，推导出暴胀双谱的“分离宇宙”方法。我们在量子效应中工作到树级，但在慢卷膨胀中工作到所有阶，质量是微扰调节的。我们的方法为解释暴胀关联函数的时间依赖性提供了一个系统的基础，并具有直接的应用。首先，我们使用我们的结果，以获得正确的匹配处方之间的“量子”和“经典”部分的独立宇宙计算。其次，我们阐述了这种方法在其有效性不明确的情况下的应用。作为我们的计算的副产品，我们给出了领先的慢滚校正的三点函数的场波动的空间平坦的超曲面在一个典型的，多场模型。
英文摘要：
We derive the 'separate universe' method for the inflationary bispectrum, beginning directly from a field-theory calculation. We work to tree-level in quantum effects but to all orders in the slow-roll expansion, with masses accommodated perturbatively. Our method provides a systematic basis to account for novel sources of time-dependence in inflationary correlation functions, and has immediate applications. First, we use our result to obtain the correct matching prescription between the 'quantum' and 'classical' parts of the separate universe computation. Second, we elaborate on the application of this method in situations where its validity is not clear. As a by-product of our calculation we give the leading slow-roll corrections to the three-point function of field fluctuations on spatially flat hypersurfaces in a canonical, multiple-field model.
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