Classification of Six Derivative Lagrangians of Gravity and Static Spherically Symmetric Solutions

Abstract

We classify all the six derivative Lagrangians of gravity, whose traced field equations are of second or third order, in arbitrary dimensions. In the former case, the Lagrangian in dimensions greater than six, reduces to an arbitrary linear combination of the six dimensional Euler density and the two linearly independent cubic Weyl invariants. In five dimensions, besides the independent cubic Weyl invariant, we obtain an interesting cubic combination, whose field equations for static spherically symmetric spacetimes are of second order. In the later case, in arbitrary dimensions we obtain two combinations, which in dimension three, are equivalent to the complete contraction of two Cotton tensors. Moreover, we also recover all the conformal anomalies in six dimensions. Finally, we present some static, spherically symmetric solutions for these Lagrangians.

16 pages, no figures, V2: The analogy between the BHT new massive gravity Lagrangian and the special cubic invariant in five dimensions, made more precise. A conjecture for higher order generalization added.V3: Final version to appear on PRD

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