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On the stability of Jordan-Brans-Dicke static universe

Sergio del Campoa, Ramón Herreraa and Pedro Labrañab

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In this work we study the stability of the Jordan-Brans-Dicke (JBD) static universe. This is motivated by the possibility that the universe might have started out in an asymptotically JBD static state, in the context of the so called emergent universe scenario. We extent our previous results on stability of JBD static universe by considering spatially homogeneous Bianchi type IX anisotropic perturbation modes and by including more general perfect fluids. Contrary to general relativity, we have found that the JBD static universe, dominated by a standard perfect fluid, could be stable against isotropic and anisotropic perturbations. The implications of these results for the initial state of the universe and its pre-inflationary evolution are discussed.

Keywords

modified gravity

physics of the early universe

PACS

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 07 (July 2009)

Received 4 May 2009, accepted for publication 9 June 2009

Published 3 July 2009



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