Abstract
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 an 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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Capozziello, S., de Ritis, R. & Marino, A.A. Recovering the Effective Cosmological Constant in Extended Gravity Theories. General Relativity and Gravitation 30, 1247–1272 (1998). https://doi.org/10.1023/A:1026651129626
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DOI: https://doi.org/10.1023/A:1026651129626