String Dilaton Fluid Cosmology

Details String Dilaton Fluid Cosmology String Dilaton Fluid Cosmology

1998-05-13

arxiv.org/abs/gr-qc/9805046v1

Int.J.Mod.Phys.D8:213-227,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, Latex, submitted to Int. Jou. Mod. Phys. D

Scientific paper

10.1142/S0218271899000183

We investigate $(n+1)$-dimensional string-dilaton cosmology with effective dilaton potential in presence of perfect-fluid matter.We get exact solutions parametrized by the constant $\gam$ of the state equation $p=(\gam-1)\rho$, the spatial dimension number $n$, the bulk of matter, and the spatial curvature constant $k$. Several interesting cosmological behaviours are selected. Finally we discuss the recovering of ordinary Einstein gravity starting from string dominated regime and a sort of asymptotic freedom due to string effective coupling.

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