INTRODUCTION TO MODIFIED GRAVITY AND GRAVITATIONAL ALTERNATIVE FOR DARK ENERGY

By Shin'ichi Nojiri, Sergei D. Odintsov. 2006

1,710 citations recorded by the source corpus.

We review various modified gravities considered as gravitational alternative for dark energy. Specifically, we consider the versions of f(R), f(G) or f(R, G) gravity, model with non-linear gravitational coupling or string-inspired model with Gauss-Bonnet-dilaton coupling in the late universe where they lead to cosmic speed-up. It is shown that some of such theories may pass the Solar System tests. On the same time, it is demonstrated that they have quite rich cosmological structure: they may naturally describe the effective (cosmological constant, quintessence or phantom) late-time era with a possible transition from decceleration to acceleration thanks to gravitational terms which increase with scalar curvature decrease. The possibility to explain the coincidence problem as the manifestation of the universe expansion in such models is mentioned. The late (phantom or quintessence) universe filled with dark fluid with inhomogeneous equation of state (where inhomogeneous terms are originated from the modified gravity) is also described.

Subfields: Artificial Intelligence, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d71e942f39327372223394499c21f4b985d32bee

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Citations in the corpus

Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “The classical and quantum stability of these solutions has been investigated (see respectively [328] and [327]) while their compatibility with Solar System tests was studied, for example, in [908].”
Observational constraints on teleparallel dark energy (2011, background): “The other approach is to modify the gravitational sector itself (see [37] for a review and references therein).”
The imperfect fluid behind kinetic gravity braiding (2011, neutral): “[73–75].”
f(R) Theories (2010, background): “There are other review articles on f (R) gravity [556, 555, 618] and modified gravity [171, 459, 126, 397, 217].”
On the Evolution of the Hubble Constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: A Feasibility Study for GRB-Cosmology in 2030 (2022, background): “The most natural extended framework is the f (R)-gravity proposal [162,163,167,381] which contains only an additional scalar degree of freedom.”