Dark energy generated from a (super-) string effective action with higher-order curvature corrections and a dynamical dilaton

Elizalde, E. ; Jhingan, S. ; Nojiri, S. ; Odintsov, S. D. ; Sami, M. ; Thongkool, I. (2008) Dark energy generated from a (super-) string effective action with higher-order curvature corrections and a dynamical dilaton The European Physical Journal C (EPJ C) - Particles and Fields, 53 (3). pp. 447-457. ISSN 1434-6044

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Official URL: http://www.springerlink.com/content/n987947w52481v...

Related URL: http://dx.doi.org/10.1140/epjc/s10052-007-0463-8

Abstract

We investigate the possibility of a dark energy universe emerging from an action with higher-order string loop corrections to Einstein gravity in the presence of a massless dilaton. These curvature corrections (up to R4 order) are different depending upon the type of (super-) string model which is considered. We find in fact that type II, heterotic, and bosonic strings respond differently to dark energy. A dark energy solution is shown to exist in the case of the bosonic string, while the other two theories do not lead to realistic dark energy universes. A detailed analysis of the dynamical stability of the de Sitter solution is presented for the case of a bosonic string. A general prescription for the construction of a de Sitter solution for the low-energy (super-) string effective action is also indicated. Beyond the low-energy (super-) string effective action, when the higher-curvature correction coefficients depend on the dilaton, the reconstruction of the theory from the expansion history of the universe is done with a corresponding prescription for the scalar potentials.

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ID Code:70511
Deposited On:21 Nov 2011 05:41
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