Cosmological singularities and modified theories of gravity

Details Cosmological singularities and modified theories of gravity Cosmological singularities and modified theories of gravity

2009-03-27

arxiv.org/abs/0903.4775v2

Physics and Mathematics of Gravitation: Proceedings of the Spanish Relativity Meeting 2008, AIP Conference Proceedings Volume

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4pp, to appear in AIP Conference: Proc. XXXI Spanish Relat. Meeting, ERE08, Salamanca, Spain, 15-19 Sept., 2008

Scientific paper

We consider perturbative modifications of the Friedmann equations in terms of energy density corresponding to modified theories of gravity proposed as an alternative route to comply with the observed accelerated expansion of the universe. Assuming that the present matter content of the universe is a pressureless fluid, the possible singularities that may arise as the final state of the universe are surveyed. It is shown that, at most, two coefficients of the perturbative expansion of the Friedman equations are relevant for the analysis. Some examples of application of the perturbative scheme are included.

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