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- Title
Disappearing cosmological constant in f( R) gravity.
- Authors
Starobinsky, A. A.
- Abstract
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 a small discrepancy in the values of the slope of the primordial perturbation power spectrum determined from galaxy surveys and CMB fluctuations. On the other hand, a new problem for dark energy models based on f( R) gravity is pointed out, which is connected with the possible overproduction of new massive scalar particles (scalarons) arising in this theory in the very early Universe.
- Subjects
SPECTRUM analysis; SOLAR system; ASTRONOMICAL perturbation; POWER (Mechanics); FORCE &; energy; METAPHYSICAL cosmology
- Publication
JETP Letters, 2007, Vol 86, Issue 3, p157
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364007150027