De Sitter vacua in no-scale supergravities and Calabi-Yau string models
De Sitter vacua in no-scale supergravities and Calabi-Yau string models
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无尺度超重力中的德西特真空和卡拉比-丘弦模型
DOI：
10.1088/1126-6708/2008/06/057
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发表时间：
2008
影响因子：
5.4
通讯作者：
C. Scrucca
中科院分区：
文献类型：
--
作者：
L. Covi;M. Gómez;C. Gross;J. Louis;G. Palma;C. Scrucca
本文分析了在弦模型的模扇区中获得具有自发破缺的N = 1超对称性和非负宇宙学常数的亚稳真空的可能性。更具体地说，我们研究的条件下，标量合作伙伴的Goldstino是非快子，这只取决于Kahler潜力。这个条件不仅是必要的，而且是充分的，因为如果超势被适当地调整，所有其他标量场都可以被赋予任意大的正平方质量。我们认为杂种优势和orientifold弦紧化在大体积的限制，并表明，这些模型共享的无标度属性严重限制了允许的值为'sGoldstino'群众在超势参数空间。我们发现，一个积极的质量项可能只实现某些类型的紧化和特定的Goldstino方向。此外，我们还展示了如何对Kahler势进行子导修正，从而打破无标度特性，从而提升这些质量。
We perform a general analysis on the possibility of obtaining metastable vacua with spontaneously broken N = 1 supersymmetry and non-negative cosmological constant in the moduli sector of string models. More specifically, we study the condition under which the scalar partners of the Goldstino are non-tachyonic, which depends only on the Kahler potential. This condition is not only necessary but also sufficient, in the sense that all of the other scalar fields can be given arbitrarily large positive square masses if the superpotential is suitably tuned. We consider both heterotic and orientifold string compactifications in the large-volume limit and show that the no-scale property shared by these models severely restricts the allowed values for the 'sGoldstino' masses in the superpotential parameter space. We find that a positive mass term may be achieved only for certain types of compactifications and specific Goldstino directions. Additionally, we show how subleading corrections to the Kahler potential which break the no-scale property may allow to lift these masses.