Parameter plot in the space of dimensionless parameters in the deformation of Einstein's gravity.

From the article:

Island of Stability for Consistent Deformations of Einstein’s Gravity
Felix Berkhahn, Dennis D. Dietrich, Stefan Hofmann, Florian Kühnel, and Parvin Moyassari
Phys. Rev. Lett. 108, 131102 (2012)

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