Disappearing cosmological constant in f(R) gravity

  title={Disappearing cosmological constant in f(R) gravity},
  author={Alexei A. Starobinsky},
  journal={JETP Letters},
For higher-derivative f(R) gravity, where R is the Ricci scalar, a class of models is proposed, which produce viable cosmology different from the ACDM at recent times and satisfy cosmological, Solar System, and laboratory tests. These models have both flat and de Sitter spacetimes as particular solutions in the absence of matter. Thus, a cosmological constant is zero in a flat spacetime, but appears effectively in a curved one for sufficiently large R. A “smoking gun” for these models would be… 

Cosmological evolution in f(R) gravity and a logarithmic model

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Modified gravity with disappearing cosmological constant

  • L. Granda
  • Physics
    Journal of High Energy Physics
  • 2021
New corrections to General Relativity are considered in the context of modified f(R) gravity, that satisfy cosmological and local gravity constraints. The proposed models behave asymptotically as R −

Curing singularities in cosmological evolution of F(R) gravity

We study F(R) modified gravity models which are capable of driving the accelerating epoch of the Universe at the present time whilst not destroying the standard Big Bang and inflationary cosmology.

Cosmology based on f(R) gravity with 𝒪(1) eV sterile neutrino

We address the cosmological role of an additional 𝒪(1) eV sterile neutrino in modified gravity models. We confront the present cosmological data with predictions of the FLRW cosmological model based

ΛCDM without cosmological constant

  • L. Granda
  • Physics
    Classical and Quantum Gravity
  • 2021
A type of exponential correction to general relativity gives viable modified gravity model of dark energy. The model behaves as R − 2Λ at large curvature where an effective cosmological constant

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Modified f(R) gravity is one of the most promising candidates for dark energy, and even for the unification of the whole cosmological evolution, including the inflationary phase. Within this class of

Aspects of cosmological expansion in F(R) gravity models

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Large scale structure of f(R) gravity

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Recent observations of Type 1a supernovae indicating an accelerating universe have once more drawn attention to the possible existence, at the present epoch, of a small positive Lambda-term

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The Cauchy problem for the R+R2 theories of gravity without torsion

The exterior Cauchy problem is discussed for the fourth‐order theories of gravity derived from the Lagrangian densities L=(−g)1/2 (R+ (1/2)aR2+bRμν Rμν) −κLm. When b≠0, the Cauchy problem can be

Curvature Quintessence

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