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On Black Hole Structures in Scalar-Tensor Theories of Gravity

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arxiv 1603.03692 v1 pith:PLRIMOYU submitted 2016-03-11 gr-qc astro-ph.HEhep-th

Kirill A. Bronnikov , Júlio C. Fabris , Denis C. Rodrigues This is my paper · ORCID
classification gr-qcastro-ph.HEhep-th
keywords blackcoldfieldgravityholeholespropertiesscalar
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abstract

We review some properties of black hole structures appearing in gravity with a massless scalar field, with both minimal and nonminimal coupling. The main properties of the resulting cold black holes are described. The study of black holes in scalar-gravity systems is extended to $k$-essence theories, and some examples are explicitly worked out. In these cases, even while the existence of horizons is possible, the metric regularity requirement on the horizon implies either a cold black type structure or a singular behavior of the scalar field.

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  1. On the instability of some k-essence space-times

    gr-qc 2019-08 conditional novelty 6.0 of 10

    Two previously found k-essence black hole/wormhole solutions are shown to be unstable under radial perturbations, and a generic instability is argued for power-law k-essence with exponent n < 1/2.

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