Effective gravity theories with dilations

Abstract

Inclusion of the dilation in the Einstein plus Gauss-Bonnet model removes the de Sitter ground state permitted in its absence; the generic case with higher order invariants is discussed. Spherically symmetric static solutions are considered and their asymptotic behavior established; they are nontrivial only for a nonvanishing dilaton field and are compatible with the existence of an horizon at which the dilaton is regular.

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