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arXiv 0710.3883hep-thastro-phhep-ph
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II型弦论中的轴子暴胀

Axion Inflation in Type II String Theory

Thomas W. Grimm

摘要:

在N=1超对称的IIB型紧化的背景下讨论了由大量轴子场驱动的暴胀模型。在紧致几何中,暴胀子作为R-R双形式的标量模出现在消失双圈上。消失的周期被解决的小的两个体积或NS-NS B-场,坐在一起的同一超多重态的暴胀子。弦世界表包裹消失的循环纠正R-R膨胀的度量。它们可以帮助产生接近普朗克尺度的动力学项,以及在暴胀期间轴子和它们的非轴子伙伴之间的质量等级。在小弦耦合下,D-膜修正在R-R暴胀子的度规中是次要的。然而,一个轴子势可以由D1瞬子或D5膜上的高吉诺凝聚产生。具有足够大数量的轴子的模型允许混沌暴胀区域,这种区域可以延伸到整个轴子场范围,以获得来自高根诺凝聚的势。这些模型可以允许可能检测到的张量与标量比高达r<0.14的引力波。

英文摘要:

Inflationary models driven by a large number of axion fields are discussed in the context of type IIB compactifications with N=1 supersymmetry. The inflatons arise as the scalar modes of the R-R two-forms evaluated on vanishing two-cycles in the compact geometry. The vanishing cycles are resolved by small two-volumes or NS-NS B-fields which sit together with the inflatons in the same supermultiplets. String world-sheets wrapping the vanishing cycles correct the metric of the R-R inflatons. They can help to generate kinetic terms close to the Planck scale and a mass hierarchy between the axions and their non-axionic partners during inflation. At small string coupling, D-brane corrections are subleading in the metric of the R-R inflatons. However, an axion potential can be generated by D1 instantons or gaugino condensates on D5 branes. Models with sufficiently large number of axions admit regions of chaotic inflation which can stretch over the whole axion field range for potentials from gaugino condensates. These models could allow for a possibly detectable amount of gravitational waves with tensor to scalar ratio as high as r<0.14.

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