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arXiv 0707.4583hep-th
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翘曲与F项隆升

Warping and F-term uplifting

Philippe Brax, Anne-Christine Davis, Stephen C. Davis, Rachel Jeannerot, Marieke Postma

摘要:

我们分析了D3和D 7-膜上物质翘曲紧化的有效超引力模型。我们发现,翘曲因子的主要作用是修改F项,而保持D项不变。因此,只有通过几乎消失的D项和F项的提升,才能实现具有模稳定性和由大扭曲引起的小的正宇宙学常数的扭曲模型。通过研究磁化D 7-膜上的高吉诺凝聚的弦动机的例子,我们发现,即使D项消失,也很难实现合理的参数选择的Minkowski最小值。当与国际空间站的扇区耦合时,AdS真空被抬升,产生一个小的引力子质量,翘曲因子为10^-5。

英文摘要:

We analyse the effective supergravity model of a warped compactification with matter on D3 and D7-branes. We find that the main effect of the warp factor is to modify the F-terms while leaving the D-terms invariant. Hence warped models with moduli stabilisation and a small positive cosmological constant resulting from a large warping can only be achieved with an almost vanishing D-term and a F-term uplifting. By studying string-motivated examples with gaugino condensation on magnetised D7-branes, we find that even with a vanishing D-term, it is difficult to achieve a Minkowski minimum for reasonable parameter choices. When coupled to an ISS sector the AdS vacua is uplifted, resulting in a small gravitino mass for a warp factor of order 10^-5.

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