Supergravity Analysis of Hybrid Inflation Model from D3--D7 System - eScholarship
Supergravity Analysis of Hybrid Inflation Model from D3--D7 System - eScholarship
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D3--D7系统混合暴胀模型的超重力分析 - eScholarship
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Watari
中科院分区：
文献类型：
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作者：
F. Koyama;Yuji Tachikawa;T. Watari
缓慢滚动的膨胀是一个美丽的范例，然而，当考虑到未知的引力效应时，膨胀的潜力很难足够平坦。然而，在D = 4 N = 1超重力下构建的混合暴胀模型可以与N = 2超对称相一致，并且可以自然地嵌入到弦理论中。本文采用D = 4超重力描述，详细讨论了弦模型中的引力效应。为了确定，我们采用了在K3 × T^2/Z_2取向褶上紧化的IIB型弦理论的D3—D7系统。结果表明，尽管模型的Kahler势非极小，但慢滚参数可以足够小。这种情况发生的条件在弦真空中得到了澄清。我们还发现，通过引入一定的3型通量，吹灭奇点所得到的正真空能量所必需的几何形状是稳定的。
The slow-roll inflation is a beautiful paradigm, yet the inflaton potential can hardly be sufficiently flat when unknown gravitational effects are taken into account. However, the hybrid inflation models constructed in D = 4 N = 1 supergravity can be consistent with N = 2 supersymmetry, and can be naturally embedded into string theory. This article discusses the gravitational effects carefully in the string model, using D = 4 supergravity description. We adopt the D3--D7 system of Type IIB string theory compactified on K3 x T^2/Z_2 orientifold for definiteness. It turns out that the slow-roll parameter can be sufficiently small despite the non-minimal Kahler potential of the model. The conditions for this to happen are clarified in terms of string vacua. We also find that the geometry obtained by blowing up singularity, which is necessary for the positive vacuum energy, is stabilized by introducing certain 3-form fluxes.