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Recovering the Cosmological Constant in Scalar-Tensor Cosmologies

Research paper by S. Capozziello, R. de Ritis

Indexed on: 01 Nov '97Published on: 01 Nov '97Published in: General Relativity and Gravitation



Abstract

We extend the 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 an asymptotic de Sitter expansion, independently of any initial data, by a sort of time-dependent (effective) cosmological constant. Finally we apply the results to some specific models.