Volume Modulus Inflation and the Gravitino Mass Problem

Details Volume Modulus Inflation and the Gravitino Mass Problem Volume Modulus Inflation and the Gravitino Mass Problem

2008-06-04

arxiv.org/abs/0806.0809v2

JCAP 0809:011,2008

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, JHEP style; v2. refs added

Scientific paper

10.1088/1475-7516/2008/09/011

The Hubble constant during the last stages of inflation in a broad class of models based on the KKLT mechanism should be smaller than the gravitino mass, H <~ m_{3/2}. We point out that in the models with large volume of compactification the corresponding constraint typically is even stronger, H <~ m_{3/2}^{3/2}, in Planck units. In order to address this problem, we propose a class of models with large volume of compactification where inflation may occur exponentially far away from the present vacuum state. In these models, the Hubble constant during inflation can be many orders of magnitude greater than the gravitino mass. We introduce a toy model describing this scenario, and discuss its strengths and weaknesses.

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