Evolution of Fluctuations during Graceful Exit in String Cosmology

Details Evolution of Fluctuations during Graceful Exit in String Cosmology Evolution of Fluctuations during Graceful Exit in String Cosmology

1999-03-04

arxiv.org/abs/gr-qc/9903017v2

Phys.Lett. B460 (1999) 41-46

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 5 figures, Revtex, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(99)00736-4

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.

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