Newton law corrections and instabilities in $f(R)$ gravity with the effective cosmological constant epoch

Details Newton law corrections and instabilities in $f(R)$ gravity with the effective cosmological constant epoch Newton law corrections and instabilities in $f(R)$ gravity with the effective cosmological constant epoch

2007-06-10

arxiv.org/abs/0706.1378v2

Phys.Lett.B652:343-348,2007

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 9 pages, correction/clarification is made

Scientific paper

10.1016/j.physletb.2007.07.039

We consider class of modified $f(R)$ gravities with the effective cosmological constant epoch at the early and late universe. Such models pass most of solar system tests as well they satisfy to cosmological bounds. Despite their very attractive properties, it is shown that one realistic class of such models may lead to significant Newton law corrections which become small at the future universe only. The model with acceptable Newton law regime shows the matter instability. This suggests that more complicated version of such theory (or extended parameters space) should be investigated.

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