Quantum effects and stability of chameleon cosmology

Details Quantum effects and stability of chameleon cosmology Quantum effects and stability of chameleon cosmology

2003-10-31

arxiv.org/abs/hep-th/0310296v2

Mod.Phys.Lett.A19:1273-1280,2004

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 10 pages, references are added

Scientific paper

10.1142/S0217732304015282

One possibility to explain the current accelerated expansion of the universe may be related with the presence of cosmologically evolving scalar whose mass depends on the local matter density (chameleon cosmology). We point out that matter quantum effects in such scalar-tensor theory produce the chameleon scalar field dependent conformal anomaly. Such conformal anomaly adds higher derivative terms to chameleon field equation of motion. As a result, the principal possibility for instabilities appears. These instabilities seem to be irrelevant at small curvature but may become dangerous in the regions where gravitational field is strong.

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