Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-09-15
Phys.Lett. B443 (1998) 97-103
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, latex with epsf, 1 figure. Revised estimate of amplitude of density perturbations and extended discussion of possible
Scientific paper
10.1016/S0370-2693(98)01322-7
We discuss the semi-classical perturbation spectra produced in the massless fields of the low energy string action in a pre big bang type scenario. Axion fields may possess an almost scale-invariant spectrum on large scales dependent upon the evolution of the dilaton and moduli fields to which they are coupled. As an example we calculate the spectra for three axion fields present in a truncated type IIB model and show that they are related with at least one of the fields having a scale-invariant or red perturbation spectrum. In the simplest pre big bang scenario this may be inconsistent with the observed isotropy of the microwave background. More generally, relations between the perturbation spectra in low energy string cosmologies reflect the symmetries of the theory.
Copeland Edmund J.
Lidsey James E.
Wands David
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