No static regular black holes in Einstein-complex-scalar-Gauss-Bonnet gravity

Abstract

In this brief report, we investigate the existence of 4-dimensional static spherically symmetric black holes (BHs) in the Einstein-complex-scalar-Gauss-Bonnet (EcsGB) gravity with an arbitrary potential $V(\varphi )$ and a coupling $f(\varphi )$ between the scalar field $\varphi$ and the Gauss-Bonnet (GB) term. We find that static regular BH solutions with complex scalar hairs do not exist. This conclusion does not depend on the coupling between the GB term and the scalar field, nor on the scalar potential $V(\varphi )$ and the presence of a cosmological constant $\Lambda$ (which can be either positive or negative), as longer as the scalar field remains complex and is regular across the horizon.

arXiv commentrevtex4, no figures and tables. Version to appear in Phys. Rev. D

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