Modified gravity with negative and positive powers of curvature: Unification of inflation and cosmic acceleration

Shin'ichi Nojiri, Sergei D. Odintsov
2003 Physical Review D, Particles and fields  
The modified gravity, which eliminates the need for dark energy and which seems to be stable, is considered. The terms with positive powers of the curvature support the inflationary epoch while the terms with negative powers of the curvature serve as effective dark energy, supporting current cosmic acceleration. The equivalent scalar-tensor gravity may be compatible with the simplest solar system experiments.
doi:10.1103/physrevd.68.123512 fatcat:mgj2hwzu7jd2tg7tgprja2ugl4