Natural inflation with and without modulations in type IIB string theory
Natural inflation with and without modulations in type IIB string theory
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DOI：
10.1007/jhep04(2015)160
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发表时间：
2014-11
影响因子：
5.4
通讯作者：
H. Abe;Tatsuo C. Kobayashi;Hajime Otsuka
中科院分区：
文献类型：
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作者：
H. Abe;Tatsuo C. Kobayashi;Hajime Otsuka
在IIB型弦理论的框架下，我们提出了一种有调制和无调制的自然暴胀机制。我们显式地构造了复结构、伸缩子和Kähler模的稳定势，其中复结构模的虚分量之一变成了光，被标识为膨胀子。膨胀子势是由伽吉诺凝聚项产生的，它接受由复结构模场的场值确定的单圈阈值修正，并通过单圈因子的逆来增强膨胀子的轴子衰变常数。我们还发现，阈值修正也可以诱导对自然暴胀的原始标量势的调制。根据这些调制，我们可以预测几种大小的张量标量比，以及WMAP、Planck和/或BICEP2合作报告的其他宇宙学观测数据。
We propose a mechanism for the natural inflation with and without modulation in the framework of type IIB string theory on toroidal orientifold or orbifold. We explicitly construct the stabilization potential of complex structure, dilaton and Kähler moduli, where one of the imaginary component of complex structure moduli becomes light which is identified as the inflaton. The inflaton potential is generated by the gaugino-condensation term which receives the one-loop threshold corrections determined by the field value of complex structure moduli and the axion decay constant of inflaton is enhanced by the inverse of one-loop factor. We also find the threshold corrections can also induce the modulations to the original scalar potential for the natural inflation. Depending on these modulations, we can predict several sizes of tensor-to-scalar ratio as well as the other cosmological observables reported by WMAP, Planck and/or BICEP2 collaborations.