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8 papers · 1 filter
f(R,T) gravity
Tiberiu Harko, Francisco S. N. Lobo, Shin'ichi Nojiri +1
We consider f(R,T) modified theories of gravity, where the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar R and of the trace of the stress-energy te…
Time-dependent matter instability and star singularity in gravity
Kazuharu Bamba, Shin'ichi Nojiri, Sergei D. Odintsov
We investigate a curvature singularity appearing in the star collapse process in gravity. In particular, we propose an understanding of the mechanism to produce the curvatur…
Hydrostatic equilibrium and stellar structure in f(R)-gravity
S. Capozziello, M. De Laurentis, S. D. Odintsov +1
We investigate the hydrostatic equilibrium of stellar structure by taking into account the modi- fied Laé-Emden equation coming out from f(R)-gravity. Such an equation is obtained…
Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
Shin'ichi Nojiri, Sergei D. Odintsov
Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. Th…
Screening of cosmological constant in non-local gravity
Shin'ichi Nojiri, Sergei D. Odintsov, Misao Sasaki +1
We discuss a possible mechanism to screen a cosmological constant in non-local gravity. We find that in a simple model of of non-local gravity with the Lagrangian of the form, $R+f…
One-loop effective action for non-local modified Gauss-Bonnet gravity in de Sitter space
Guido Cognola, Emilio Elizalde, Shin'ichi Nojiri +2
We discuss the classical and quantum properties of non-local modified Gauss-Bonnet gravity in de Sitter space, using its equivalent representation via string-inspired local scalar-…