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Small Cosmological Constant from Running Gravitational Coupling | Andrei V. Frolov
; Jun-Qi Guo
; | Date: |
26 Jan 2011 | Abstract: | 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. | Source: | arXiv, 1101.4995 | Services: | Forum | Review | PDF | Favorites |
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