A time--dependent Cosmological Constant

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

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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/148462

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/9605070
 http://arxiv.org/abs/astro-ph/9605070

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arXiv