Cosmological models with dynamical lambda in scalar-tensor theories

Details Cosmological models with dynamical lambda in scalar-tensor theories Cosmological models with dynamical lambda in scalar-tensor theories

1999-07-05

arxiv.org/abs/gr-qc/9907016v2

Phys.Rev. D60 (1999) 123501

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, Latex file, a sign in Eq. (2.17) was corrected, reference [37] was corrected

Scientific paper

10.1103/PhysRevD.60.123501

In the context of a family os scalar-tensor theories with a dynamical $\Lambda$, that is a binomial on the scalar field, the cosmological equations are considered. A general barotropic state equation $p=(\gamma-1)\rho$, for a perfect fluid is used for the matter content of the Universe. Some Friedmann- Robertson-Walker exact solutions are found, they have scale factor wich shows exponential or power law dependence on time. For some models the singularity can be avoided. Cosmological parameters as $\Omega_m$, $\Omega_{\Lambda}$, $q_0$ and $t_0$ are obtained and compared with observational data.

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