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arXiv 0812.3551hep-th
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关于SU(3)-结构流形上IIA型紧化的宇宙学

On the Cosmology of Type IIA Compactifications on SU(3)-structure Manifolds

Claudio Caviezel, Paul Koerber, Simon Kors, Dieter Lust, Timm Wrase, Marco Zagermann

摘要:

研究了具有非零几何通量的SU(3)结构流形的定向折叠上IIA型紧化的宇宙学性质。这些紧化产生了有效的4D N=1超引力理论,这些理论不属于最近证明的反对德西特真空和慢卷膨胀的不可行定理。然而,关注一类基于陪集空间的模型,我们可以使用一个精炼的不可行定理,排除德西特真空和慢卷暴胀,只有一种情况除外。改进的no-go定理使用了非线性子和Kaehler模量的特定线性组合,这与整体体积模量不同。它为第一个慢滚参数设置了一个下限:>=2。唯一没有被排除的情况是流形SU(2)x SU(2),我们确实找到了临界点,其值为零。然而,我们能找到的所有点都有一个对应于eta参数eta<=-2.4的快子。

英文摘要:

We study cosmological properties of type IIA compactifications on orientifolds of SU(3)-structure manifolds with non-vanishing geometric flux. These compactifications give rise to effective 4D N=1 supergravity theories that do not fall under some recently-proven no-go theorems against de Sitter vacua and slow-roll inflation. Focusing on a well-understood class of models based on coset spaces, however, we can use a refined no-go theorem that rules out de Sitter vacua and slow-roll inflation in all but one case. The refined no-go theorem uses the dilaton and a specific linear combination of the Kaehler moduli, which is different from the overall volume modulus. It puts a lower bound on the first slow-roll parameter: epsilon>=2. The only case not ruled out is the manifold SU(2)x SU(2), for which we indeed find critical points with epsilon numerically zero. However, all the points we could find have a tachyon corresponding to an eta-parameter eta<= -2.4.

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