Axion inflation with cross-correlated axion isocurvature perturbations
Axion inflation with cross-correlated axion isocurvature perturbations
复制标题
具有互相关轴子等曲率扰动的轴子膨胀
DOI：
10.1088/1475-7516/2016/01/044
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发表时间：
2016
影响因子：
6.4
通讯作者：
T. Kobayashi and H. Otsuka
中科院分区：
文献类型：
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作者：
K. Kadota;T. Kobayashi and H. Otsuka
我们研究了在超弦理论框架下的暴胀情形，其中暴胀子是一个产生绝热曲率扰动的轴子，同时存在另一个产生等曲率扰动的轻轴子。我们讨论了弦轴之间的非平凡耦合是如何产生的，并通过具体的例子计算了绝热模态和等曲率模态之间的相互关系。基于普朗克对一般相关等曲率扰动的分析，我们证明了轴子单调暴胀倾向于存在相关等曲率模式，而自然暴胀则不赞成这种等曲率模式。
We study the inflation scenarios, in the framework of superstring theory, where the inflaton is an axion producing the adiabatic curvature perturbations while there exists another light axion producing the isocurvature perturbations. We discuss how the non-trivial couplings among string axions can generically arise, and calculate the consequent cross-correlations between the adiabatic and isocurvature modes through concrete examples. Based on the Planck analysis on the generally correlated isocurvature perturbations, we show that there is a preference for the existence of the correlated isocurvature modes for the axion monodromy inflation while the natural inflation disfavors such isocurvature modes.