A purely quadratic, scale-invariant gravity action becomes critical when beta equals 6 alpha, turning its massive spin-two ghost into a massless graviton.
Scale-invariant rotating black holes in quadratic gravity
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abstract
Black hole solutions in pure quadratic theories of gravity are interesting since they allow to formulate a set of scale-invariant thermodynamics laws. Recently, we have proven that static scale-invariant black holes have a well-defined entropy, which characterizes equivalent classes of solutions. In this paper, we generalize these results and explore the thermodynamics of rotating black holes in pure quadratic gravity.
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Critical gravity from four dimensional scale invariant gravity
A purely quadratic, scale-invariant gravity action becomes critical when beta equals 6 alpha, turning its massive spin-two ghost into a massless graviton.