Primordial curvature perturbation during and at the end of multi-field inflation

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• 作者：Ki-Young Choi^a ; ^b ; ^{kiyoung.choi@apctp.org} ; Soo A Kim^a ; ^{sooastar@gmail.com} ; Bumseok Kyae^c ; ^{bkyae@pusan.ac.kr}
• 关键词：Inflation ; Cosmological perturbation theory ; Non-Gaussianity
• 刊名：Nuclear Physics B
• 出版年：2012
• 出版时间：21 August, 2012
• 年：2012
• 卷：861
• 期：3
• 页码：271-289
• 全文大小：218 K

文摘

We study the generation of the primordial curvature perturbation in multi-field inflation. Considering both the evolution of the perturbation during inflation and the effects generated at the end of inflation, we present a general formula for the curvature perturbation. We provide the analytic expressions of the power spectrum, spectral tilt and non-Gaussianity for the separable potentials of two inflaton scalars, and apply them to some specific models.