INTRODUCTION TO MODIFIED GRAVITY AND GRAVITATIONAL ALTERNATIVE FOR DARK ENERGY
- S. Nojiri, S. Odintsov
- Physics
- 29 January 2006
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…
Properties of singularities in the (phantom) dark energy universe
- S. Nojiri, S. Odintsov, S. Tsujikawa
- Physics, Mathematics
- 5 January 2005
The properties of future singularities are investigated in the universe dominated by dark energy including the phantom-type fluid. We classify the finite-time singularities into four classes and…
Modified gravity with negative and positive powers of the curvature: Unification of the inflation and of the cosmic acceleration
- S. Nojiri, S. Odintsov
- Physics
- 30 July 2003
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…
Unified cosmic history in modified gravity: From F ( R ) theory to Lorentz non-invariant models
- S. Nojiri, S. Odintsov
- Physics
- 2 November 2010
On the Conformal Anomaly from Higher Derivative Gravity in AdS/CFT Correspondence
- S. Nojiri, S. Odintsov
- Physics
- 3 March 1999
We follow Witten's proposal1 in the calculation of conformal anomaly from (d + 1)-dimensional higher derivative gravity via AdS/CFT correspondence. It is assumed that some d-dimensional conformal…
Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- K. Bamba, S. Capozziello, S. Nojiri, S. Odintsov
- Physics
- 14 May 2012
We review different dark energy cosmologies. In particular, we present the ΛCDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type I, II, III and IV…
Inhomogeneous equation of state of the universe: Phantom era, future singularity and crossing the phantom barrier
- S. Nojiri, S. Odintsov
- Physics
- 24 May 2005
The dark energy universe equation of state (EOS) with inhomogeneous, Hubble parameter dependent term is considered. The motivation to introduce such a term comes from time-dependent viscosity…
Black hole thermodynamics and negative entropy in de Sitter and anti-de Sitter Einstein-Gauss-Bonnet gravity
- M. Cvetič, S. Nojiri, S. Odintsov
- Physics
- 6 December 2001
Unifying phantom inflation with late-time acceleration: scalar phantom–non-phantom transition model and generalized holographic dark energy
- S. Nojiri, S. Odintsov
- Physics
- 24 June 2005
The unifying approach to early-time and late-time universe based on phantom cosmology is proposed. We consider gravity-scalar system which contains usual potential and scalar coupling function in…
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