Non-Singular Modified Gravity Unifying Inflation with Late-Time Acceleration and Universality of Viscous Ratio Bound in F(R) Theory

作者：Nojiri Shin'ichi^*; Odintsov Sergei D

来源：Progress of Theoretical Physics - Supplement, 2011, 190(190): 155-178.

DOI：10.1143/ptps.190.155

The review of basic cosmological properties of four-dimensional F(R)-gravity, including FRW equations of motion and its accelerating solutions, generalized fluid and scalar-tensor representation of the theory is done. Cosmological reconstruction equation is written and conditions for stability of cosmological solution are discussed. The overview of realistic F(R)models unifying inflation with dark energy epoch is made. The avoidance of finite-time future singularities in such theories via the introduction of R-2-term is studied. New realistic non-singular F(R)-gravity unifying early-time inflation with late-time acceleration is presented. The exit from inflationary era in such model may be caused by the gravitational scenario. It is demonstrated that five-dimensional F(R)-gravity considered as non-perturbative stringy effective action leads to universal relation for viscous bound ratio.

• 出版日期2011