Pseudo-redundant vacuum energy
arXiv:0801.4526 · doi:10.1103/PhysRevD.78.043507
Abstract
We discuss models that can account for today's dark energy. The underlying cosmological constant may be Planck scale but starts as a redundant coupling which can be eliminated by a field redefinition. The observed vacuum energy arises when the redundancy is explicitly broken, say by a non-minimal coupling to curvature. We give a recipe for constructing models, including R + 1/R type models, that realize this mechanism and satisfy all solar system constraints on gravity. A similar model, based on Gauss-Bonnet gravity, provides a technically natural explanation for dark energy and exhibits an interesting see-saw behavior: a large underlying cosmological constant gives rise to both low and high curvature solutions. Such models could be statistically favored in the string landscape.
39 pages. Appendix added. Version to appear in Phys. Rev. D
References in corpus (20)
- The Confrontation between General Relativity and Experiment
- Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
- The Cosmological Constant
- Is Cosmic Speed-Up Due to New Gravitational Physics?
- Modified gravity with negative and positive powers of the curvature: unification of the inflation and of the cosmic acceleration
- Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
- The Confrontation between General Relativity and Experiment
- Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
- Reconstruction of a scalar-tensor theory of gravity in an accelerating universe
- Flux Compactification
- 1/R gravity and Scalar-Tensor Gravity
- The Cosmology of Generalized Modified Gravity Models
- Avoiding Dark Energy with 1/R Modifications of Gravity
- String Cosmology: A Review
- Solar System constraints to general f(R) gravity
- Quintessence, the Gravitational Constant, and Gravity
- Categorizing Different Approaches to the Cosmological Constant Problem
- Solar System Constraints on Gauss-Bonnet Mediated Dark Energy
- Dark energy equation of state and anthropic selection
- Theories of the Cosmological Constant
Cited by in corpus (15)
- Theoretical Aspects of Massive Gravity
- Equivalence Principle Implications of Modified Gravity Models
- Hubble expansion and structure formation in the "running FLRW model" of the cosmic evolution
- A small cosmological constant from Abelian symmetry breaking
- Dynamically avoiding fine-tuning the cosmological constant: the "Relaxed Universe"
- Relaxing a large cosmological constant
- Filtering out the cosmological constant in the Palatini formalism of modified gravity
- Smooth Initial Conditions from Weak Gravity
- Perturbations in the relaxation mechanism for a large cosmological constant
- Some solutions for one of the cosmological constant problems
- The cosmological constant filter without big bang singularity
- BRS structure of Simple Model of Cosmological Constant and Cosmology
- Sequestering Mechanism in Scalar-Tensor Gravity
- Topological Gravity motivated by Renormalization Group
- Cosmological constant and renormalization of gravity