Recovering the effective cosmological constant in extended gravity theories

Details Recovering the effective cosmological constant in extended gravity theories Recovering the effective cosmological constant in extended gravity theories

1998-04-22

arxiv.org/abs/gr-qc/9804053v1

Gen.Rel.Grav.30:1247-1272,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

24 pages, Latex, submitted to Gen.Rel.and Grav

Scientific paper

10.1023/A:1026651129626

In the framework of extended gravity theories, we discuss the meaning of a time dependent "cosmological constant" and give a set of conditions to recover asymptotic de Sitter behaviour for a class of cosmological models independently of initial data. To this purpose we introduce a time-dependent (effective) quantity which asymptotically becomes the true cosmological constant. We will deal with scalar-tensor, fourth and higher than fourth-order theories.

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