Cosmology in scalar tensor theory and asymptotically de-Sitter Universe

Details Cosmology in scalar tensor theory and asymptotically de-Sitter Universe Cosmology in scalar tensor theory and asymptotically de-Sitter Universe

2001-03-27

arxiv.org/abs/gr-qc/0103098v1

Mod.Phys.Lett. A16 (2001) 1303-1314

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, Revtex Style, 6 Postscript figures

Scientific paper

10.1142/S021773230100442X

We have investigated the cosmological scenarios with a four dimensional effective action which is connected with multidimensional, supergravity and string theories. The solution for the scale factor is such that initially universe undergoes a decelerated expansion but in late times it enters into the accelerated expansion phase. Infact, it asymptotically becomes a de-Sitter universe. The dilaton field in our model is a decreasing function of time and it becomes a constant in late time resulting the exit from the scalar tensor theory to the standard Einstein's gravity. Also the dilaton field results the existence of a positive cosmological constant in late times.

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