S. Nojiri

Publications412
h-index78
Citations30,179
Highly Influential Citations227
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Properties of singularities in the (phantom) dark energy universe
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… Expand
INTRODUCTION TO MODIFIED GRAVITY AND GRAVITATIONAL ALTERNATIVE FOR DARK ENERGY
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… Expand
Unified cosmic history in modified gravity: From F ( R ) theory to Lorentz non-invariant models
Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. The structure and… Expand
On the Conformal Anomaly from Higher Derivative Gravity in AdS/CFT Correspondence
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… Expand
Modified gravity with negative and positive powers of the curvature: Unification of the inflation and of the cosmic acceleration
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… Expand
Inhomogeneous equation of state of the universe: Phantom era, future singularity and crossing the phantom barrier
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… Expand
Unifying inflation with ΛCDM epoch in modified f(R) gravity consistent with Solar System tests
We suggest two realistic f(R) and one F(G) modified gravities which are consistent with local tests and cosmological bounds. The typical property of such theories is the presence of the effective… Expand
Modified Gauss–Bonnet theory as gravitational alternative for dark energy
We suggest the modified gravity where some arbitrary function of Gauss-Bonnet (GB) term is added to Einstein action as gravitational dark energy. It is shown that such theory may pass solar system… Expand
Black hole thermodynamics and negative entropy in de Sitter and anti-de Sitter Einstein-Gauss-Bonnet gravity
Abstract We investigate the charged Schwarzschild–anti-de Sitter (SAdS) BH thermodynamics in 5d Einstein–Gauss–Bonnet gravity with electromagnetic field. The Hawking–Page phase transitions between… Expand
Modified gravity and its reconstruction from the universe expansion history
We develop the reconstruction program for the number of modified gravities: scalar-tensor theory, f(R), F(G) and string-inspired, scalar-Gauss-Bonnet gravity. The known (classical) universe expansion… Expand
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