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arXiv · 0812.3551

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

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

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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Claudio Caviezel, Paul Koerber, Simon Kors, Dieter Lust, Timm Wrase, Marco Zagermann. 2009-01-09. On the Cosmology of Type IIA Compactifications on SU(3)-structure Manifolds. https://doi.org/10.1088/1126-6708%2F2009%2F04%2F010

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