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arXiv 0908.1694hep-phastro-ph.COhep-th
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超引力中的三体暴胀

Tribrid Inflation in Supergravity

Stefan Antusch, Koushik Dutta, Philipp M. Kostka

摘要:

我们提出了一类新的F项混合超引力暴胀模型(SUGRA),其中的$η$ -问题是解决使用海森堡对称性或移动对称性的Kaehler势。除了暴胀子和瀑布场之外,这个类(称为三重暴胀)还包含第三个“驱动”场,它通过F项在暴胀期间提供大的真空能量。与“标准"混合情形相比,由于暴胀过程中暴胀超势(W_inf=0)消失的性质,它有几个吸引人的特点。虽然Kaehler势的对称性确保了在树水平上平坦的暴胀子势,但超势中的对称性破缺项引起的量子修正产生了势的斜率,并导致了与最近WMAP观测一致的光谱倾斜。

英文摘要:

We propose a novel class of F-term hybrid inflation models in supergravity (SUGRA) where the $η$-problem is resolved using either a Heisenberg symmetry or a shift symmetry of the Kaehler potential. In addition to the inflaton and the waterfall field, this class (referred to as tribrid inflation) contains a third 'driving' field which contributes the large vacuum energy during inflation by its F-term. In contrast to the ''standard'' hybrid scenario, it has several attractive features due to the property of vanishing inflationary superpotential (W_inf=0) during inflation. While the symmetries of the Kaehler potential ensure a flat inflaton potential at tree-level, quantum corrections induced by symmetry breaking terms in the superpotential generate a slope of the potential and lead to a spectral tilt consistent with recent WMAP observations.

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