Density perturbations in the Ekpyrotic Universe and string-inspired generalizations

Details Density perturbations in the Ekpyrotic Universe and string-inspired generalizations Density perturbations in the Ekpyrotic Universe and string-inspired generalizations

2001-10-31

arxiv.org/abs/gr-qc/0110124v2

Phys.Lett. B526 (2002) 179-185

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 3 figures, some discussions and references are added

Scientific paper

10.1016/S0370-2693(01)01526-X

We study density perturbations in several cosmological models motivated by string theory. The evolution and the spectra of curvature perturbations ${\cal R}$ are analyzed in the Ekpyrotic scenario and nonsingular string cosmologies. We find that these string-inspired models generally exhibit blue spectra in contrast to standard slow-roll inflationary scenarios. We also clarify the parameter range where ${\cal R}$ is enhanced on superhorizon scales.

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