Abstract
We show that a critical condition exists in four dimensional scale invariant gravity given by the pure quadratic action 𝛽 CμvσρCμνσρ + 𝛼 R2 where \( {C}_{\nu \sigma \rho}^{\mu } \) is the Weyl tensor, R is the Ricci scalar and 𝛽 and 𝛼 are dimensionless parameters. The critical condition in a dS or AdS background is 𝛽 = 6𝛼. This leads to critical gravity where the massive spin two physical ghost becomes a massless spin two graviton. In contrast to the original work on critical gravity, no Einstein gravity with a cosmological constant is added explicitly to the higher-derivative action. The critical condition is obtained in two independent ways. In the first case, we show the equivalence between the initial action and an action containing Einstein gravity, a cosmological constant, a massless scalar field plus Weyl squared gravity. The scale invariance is spontaneously broken. The linearized Einstein-Weyl equations about adS or AdS background yield the critical condition 𝛽 = 6𝛼. In the second case, we work directly with the original quadratic action. After a suitable field redefinition, where the metric perturbation is traceless and transverse, we obtain linearized equations about a dS or AdS background that yield the critical condition 𝛽 = 6𝛼. As in the first case, we also obtain a propagating massless scalar field. Substituting 𝛽 = 6𝛼 into the energy and entropy formula for the Schwarzschild and Kerr AdS or dS black hole in higher-derivative gravity yields zero, the same value obtained in the original work on critical gravity. We discuss the role of boundary conditions in relaxing the 𝛽 = 6𝛼 condition.
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ArXiv ePrint: 1908.08778
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Edery, A., Nakayama, Y. Critical gravity from four dimensional scale invariant gravity. J. High Energ. Phys. 2019, 169 (2019). https://doi.org/10.1007/JHEP11(2019)169
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DOI: https://doi.org/10.1007/JHEP11(2019)169