Unsuccessful cosmology with Modified Gravity Models

Details Unsuccessful cosmology with Modified Gravity Models Unsuccessful cosmology with Modified Gravity Models

2007-05-23

arxiv.org/abs/0705.3375v2

JCAP 0706:028,2007

Astronomy and Astrophysics

Astrophysics

16 pages, uses RevTeX

Scientific paper

10.1088/1475-7516/2007/06/028

A class of Modified Gravity Models, consisting of inverse powers of linear combination of quadratic curvature invariants, is studied in the full parameter space. We find that singularity-free cosmological solutions, interpolating between an almost-Friedmann universe at Big Bang Nucleosynthesis and an accelerating universe today, exist only in a restricted parameter space. Furthermore, for all parameters of the models, there is an unstable scalar mode of the gravitational field. Therefore we conclude that this class of Modified Gravity Models is not viable.

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