Accelerated Universes from type IIA Compactifications

Abstract

We study slow-roll accelerating cosmologies arising from geometric compactifications of type IIA string theory on $T^6/({\mathbb{Z}}_2\times {\mathbb{Z}}_2)$. With the aid of a genetic algorithm, we are able to find quasi-de Sitter backgrounds with both slow-roll parameters of order $0.1$. Furthermore, we study their evolution by numerically solving the corresponding time-dependent equations of motion, and we show that they actually display a few e-folds of accelerated expansion. Finally, we comment on their perturbative reliability.

22 pages, 3 figures and 5 tables

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