A time--dependent Cosmological Constant

Details A time--dependent Cosmological Constant A time--dependent Cosmological Constant

1996-05-14

arxiv.org/abs/astro-ph/9605070v2

Astronomy and Astrophysics

Astrophysics

13 pages, Latex, submitted to Phys. Lett. A

Scientific paper

We extend the Wald cosmic no-hair theorem to a general class of scalar-tensor nonminimally coupled theories of gravity where ordinary matter is also present in the form of a perfect fluid. We give a set of conditions for obtaining a de Sitter expansion independently of any initial conditions, generalizing the treatment of such a problem as given by Wald. Finally we apply the results to some specific models.

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