Coasting cosmologies with time dependent cosmological constant

Details Coasting cosmologies with time dependent cosmological constant Coasting cosmologies with time dependent cosmological constant

1998-07-07

arxiv.org/abs/gr-qc/9807016v1

Int.J.Mod.Phys. A14 (1999) 1523-1530

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, latex file (ijmpal macro), accepted for publication in Int. Mod. Phys. A

Scientific paper

10.1142/S0217751X99000762

The effect of a time dependent cosmological constant is considered in a family of scalar tensor theories. Friedmann-Robertson-Walker cosmological models for vacumm and perfect fluid matter are found. They have a linear expansion factor, the so called coasting cosmology, the gravitational "constant" decreace inversely with time; this model satisfy the Dirac hipotesis. The cosmological "constant" decreace inversely with the square of time, therefore we can have a very small value for it at present time.

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