Vacuum fluctuations in axion-dilaton cosmologies

Details Vacuum fluctuations in axion-dilaton cosmologies Vacuum fluctuations in axion-dilaton cosmologies

1997-01-17

arxiv.org/abs/hep-th/9701082v2

Phys.Rev. D56 (1997) 874-888

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 23 pages plus 6 figures, minor typos corrected and references updated. To appear in Phys Rev D

Scientific paper

10.1103/PhysRevD.56.874

We study axion-dilaton cosmologies derived from the low-energy string effective action. We present the classical homogeneous Friedmann-Robertson-Walker solutions and derive the semi-classical perturbation spectra in the dilaton, axion and moduli fields in the pre-Big Bang scenario. By constructing the unique S-duality invariant field perturbations for the axion and dilaton fields we derive S-duality invariant solutions, valid when the axion field is time-dependent as well as in a dilaton-vacuum cosmology. Whereas the dilaton and moduli fields have steep blue perturbation spectra (with spectral index n=4) we find that the axion spectrum depends upon the expansion rate of the internal dimensions (0.54

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