Long-wavelength approximation for string cosmology with barotropic perfect fluid

Details Long-wavelength approximation for string cosmology with barotropic perfect fluid Long-wavelength approximation for string cosmology with barotropic perfect fluid

2002-05-21

arxiv.org/abs/gr-qc/0205091v1

Gen.Rel.Grav. 34 (2002) 2135-2148

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, 1 figure

Scientific paper

The field equations derived from the low energy string effective action with a matter tensor describing a perfect fluid with a barotropic equation of state are solved iteratively using the long-wavelength approximation, i.e. the field equations are expanded by the number of spatial gradients. In the zero order, a quasi-isotropic solution is presented and compared with the general solution of the pure dilaton gravity. Possible cosmological models are analyzed from the point of view of the pre-big bang scenario. The second order solutions are found and their growing and decaying parts are studied.

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