S-duality Invariant Perturbations in String Cosmology

Details S-duality Invariant Perturbations in String Cosmology S-duality Invariant Perturbations in String Cosmology

1997-05-08

arxiv.org/abs/hep-th/9705050v1

Nucl.Phys. B506 (1997) 407-420

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, no figures, plain LaTeX

Scientific paper

10.1016/S0550-3213(97)00538-5

We investigate the generation of curvature and isocurvature (dilaton, moduli and axion) perturbations in a general class of axion-dilaton-moduli models,including the pre-big bang scenario. Allowing for an arbitrary coupling constant between the dilaton field and the axion field, we exploit the SL(2,R) symmetry of the theory to obtain the spectral indices of the field perturbations in a pre-big bang type scenario. Axion field fluctuations about a homogeneous background field can yield a scale-invariant (Harrison-Zel'dovich) spectrum. As an example we present a string-motivated case with SL(2,R)xSL(2,R) symmetry, where a second axion field arises from the compactification of the ten-dimensional theory to four dimensions.

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