Dark energy problem: from phantom theory to modified Gauss-Bonnet gravity

Abstract

The solution of dark energy problem in the models without scalars is presented. It is shown that late-time accelerating cosmology may be generated by the ideal fluid with some implicit equation of state. The universe evolution within modified Gauss-Bonnet gravity is considered. It is demonstrated that such gravitational approach may predict the (quintessential, cosmological constant or transient phantom) acceleration of the late-time universe with natural transiton from deceleration to acceleration (or from non-phantom to phantom era in the last case).

LaTeX 8 pages, prepared for the Proceedings of QFEXT'05, minor correctons, references added

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