Evasion of No-Hair Theorems and Novel Black-Hole Solutions in Gauss-Bonnet Theories
Abstract
We consider a general Einstein-scalar-GB theory with a coupling function f(φ). We demonstrate that black-hole solutions appear as a generic feature of this theory since a regular horizon and an asymptotically-flat solution may be easily constructed under mild assumptions for f(φ). We show that the existing no-hair theorems are easily evaded, and a large number of regular, black-hole solutions with scalar hair are then presented for a plethora of coupling functions f(φ).
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