Tensor perturbations in high-curvature string backgrounds

Details Tensor perturbations in high-curvature string backgrounds Tensor perturbations in high-curvature string backgrounds

1997-04-15

arxiv.org/abs/gr-qc/9704045v1

Phys.Rev. D56 (1997) 4815-4823

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, REVTEX, three figures included using EPSFIG. An updated collection of papers on the pre-big bang scenario in string c

Scientific paper

10.1103/PhysRevD.56.4815

We derive a generalized equation for the evolution of tensor perturbations in a cosmological background, taking into account higher-curvature contributions and a tree-level coupling to the dilaton in the string frame. The equation is obtained by perturbing the gravi-dilaton string effective action, expanded up to first order in $\alpha'$. The $\alpha'$ corrections can modify the low-energy perturbation spectrum, but the modifications are shown to be small when the background curvature keeps constant in the string frame.

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