原始功率谱环路修正的替代定义
Alternate Definitions of Loop Corrections to the Primordial Power Spectra
摘要：
我们考虑两种不同的定义为原始功率谱的环路修正。其中之一是简单地使用线性化的有效场方程来校正树阶关系中的模函数。第二个定义涉及2点相关器的空间傅里叶变换。虽然这两个定义同意在树顺序，我们表明，他们不同意在一个循环使用Schwinger-Keldysh形式主义，所以至少有两个合理的方法循环纠正树顺序的结果。我们将讨论每种方法的优点和缺点。
英文摘要：
We consider two different definitions for loop corrections to the primordial power spectra. One of these is to simply correct the mode functions in the tree order relations using the linearized effective field equations. The second definition involves the spatial Fourier transform of the 2-point correlator. Although the two definitions agree at tree order, we show that they disagree at one loop using the Schwinger-Keldysh formalism, so there are at least two plausible ways of loop correcting the tree order result. We discuss the advantages and disadvantages of each.
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