6533b85afe1ef96bd12b96dc
RESEARCH PRODUCT
Constraining inverse-curvature gravity with supernovae
Jose SantiagoOlga MenaJochen Wellersubject
High Energy Physics - TheoryPhysicsPhantom energyAstrophysics (astro-ph)FOS: Physical sciencesGeneral Physics and AstronomyBig RipGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsGeneral Relativity and Quantum CosmologyParticle horizonMetric expansion of spaceTheoretical physicsHigh Energy Physics - Theory (hep-th)De Sitter universeZero-energy universeFlatness problemScale factor (cosmology)description
We show that the current accelerated expansion of the Universe can be explained without resorting to dark energy. Models of generalized modified gravity, with inverse powers of the curvature can have late time accelerating attractors without conflicting with solar system experiments. We have solved the Friedman equations for the full dynamical range of the evolution of the Universe. This allows us to perform a detailed analysis of Supernovae data in the context of such models that results in an excellent fit. Hence, inverse curvature gravity models represent an example of phenomenologically viable models in which the current acceleration of the Universe is driven by curvature instead of dark energy. If we further include constraints on the current expansion rate of the Universe from the Hubble Space Telescope and on the age of the Universe from globular clusters, we obtain that the matter content of the Universe is 0.07 <= omega_m <= 0.21 (95% Confidence). Hence the inverse curvature gravity models considered can not explain the dynamics of the Universe just with a baryonic matter component.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-10-15 |