Small Cosmological Constant from Running Gravitational Coupling

Details Small Cosmological Constant from Running Gravitational Coupling Small Cosmological Constant from Running Gravitational Coupling

2011-01-26

arxiv.org/abs/1101.4995v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 4 figures; REVTeX 4.0

Scientific paper

In this paper, we explore an idea of having Newton's constant change its value depending on the curvature scale involved. Such modification leads to a particular scalar-tensor gravity theory, with the Lagrangian derived from renormalization group (RG) flow arguments. Assuming running of the (classical) gravitational coupling is described by the same beta function as the (quantum) one in quantum chromodynamics (QCD), one is led to a simple f(R)-type model with several striking features. The model has unique de Sitter attractor, with effective cosmological constant exponentially suppressed relative to Planck scale. Not only cosmological constant appears dynamically in this model, its value is small precisely because the gravity we observe is almost Einstein-like. With the same number of parameters as LambdaCDM and no excessively small numbers involved, this looks like an interesting cosmological model, and we investigate its dynamics and observational consequences.

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