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2011

Small Cosmological Constant from Running Gravitational Coupling

Frolov, Andrei V., Guo, Jun-Qi

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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.
Several of the well-known f(R) modified gravity models have remarkably simple description in terms of the infrared renormalization group, but not the "designer" types in general.
We find that de Sitter-like accelerated expansion can be generated even in the absence of cosmological constant term, entirely due to running of the Newton's constant.

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V. Miranda, S. E. Joras, I. Waga
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