The minimal curvature of the universe in modified gravity and conformal anomaly resolution of the instabilities

Details The minimal curvature of the universe in modified gravity and conformal anomaly resolution of the instabilities The minimal curvature of the universe in modified gravity and conformal anomaly resolution of the instabilities

2003-10-06

arxiv.org/abs/hep-th/0310045v1

Mod.Phys.Lett.A19:627-638,2004

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 15 pages

Scientific paper

10.1142/S0217732304014008

We discuss the modified gravity which may produce the current cosmic aceleration of the universe and eliminates the need for dark energy. It is shown that such models where the action quickly grows with the decrease of the curvature define the FRW universe with the minimal curvature. It is required the infinite time to reach the minimal curvature during the universe evolution. It is demonstrated that quantum effects of conformal fields may strongly suppress the instabilities discovered in modified gravity. We also briefly speculate on the modification of gravity combined with the presence of the cosmological constant dark energy.

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