Evolution of fluctuations during graceful exit in string cosmology
Mar, 1999Citations per year
Abstract: (arXiv)
We study the evolution of fluctuations in a universe dominated by a scalar field coupled to the Gauss-Bonnet term. During the graceful exit, we found non-negligible enhancements of both curvature perturbation and gravitational wave in the long wavelength limit, and we also found a short wavelength instability for steep background superinflation just after the completion of the graceful exit. This result for one possible graceful exit mechanism would provide a significant implication on the primordial spectrum from the string cos mology.Note:
- 5 pages, 5 figures, Revtex, to appear in Phys. Lett. B Report-no: KUCP0131
- cosmological model
- string model
- vacuum state: fluctuation
- field theory: scalar
- Gauss-Bonnet term
- space-time: perturbation
- gravitational radiation
- numerical calculations
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