# Black holes with surrounding matter in scalar-tensor theories.

@article{Cardoso2013BlackHW, title={Black holes with surrounding matter in scalar-tensor theories.}, author={Vitor Cardoso and Isabella P Carucci and Paolo Pani and Thomas P. Sotiriou}, journal={Physical review letters}, year={2013}, volume={111 11}, pages={ 111101 } }

We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated with the presence of matter in the vicinity of the black hole and the fact that this introduces an effective mass for the scalar. Our results highlight the importance of understanding the structure of spacetime in realistic, astrophysical black holes in scalar-tensor theories.

## 73 Citations

Superradiant instability of Kerr-de Sitter black holes in scalar-tensor theory

- Physics
- 2014

A bstractWe investigate in detail the mechanism of superradiance to render the instability of Kerr-de Sitter black holes in scalar-tensor gravity. Our results provide more clues to examine the…

Spontaneous Scalarization of Black Holes and Compact Stars from a Gauss-Bonnet Coupling.

- PhysicsPhysical review letters
- 2018

We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars. In…

Black Hole Dynamics in Einstein-Maxwell-Dilaton Theory

- Physics
- 2017

We consider the properties and dynamics of black holes within a family of alternative theories of gravity, namely Einstein-Maxwell-dilaton (EMD) theory. We analyze the dynamical evolution of…

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- PhysicsClassical and Quantum Gravity
- 2020

We construct rotating black holes in Einstein-scalar-Gauss-Bonnet theory with a quadratic coupling function. We map the domain of existence of the rotating fundamental solutions, we construct…

Spontaneous scalarization in generalized scalar-tensor theory

- PhysicsPhysical Review D
- 2019

Spontaneous scalarization is a mechanism that endows relativistic stars and black holes with a nontrivial configuration only when their spacetime curvature exceeds some threshold. The standard way to…

Superradiant instabilities by accretion disks in scalar-tensor theories

- Physics
- 2022

We study the superradiant instability in scalar-tensor theories of gravitation, where matter outside a black hole provides an effective mass to the scalar degree of freedom of the gravitational…

Dynamical charged black hole spontaneous scalarization in anti–de Sitter spacetimes

- PhysicsPhysical Review D
- 2021

We study the fully nonlinear dynamics of black hole spontaneous scalarizations in Einstein Maxwell scalar theory with coupling function f(φ) = e−bφ2 , which can transform usual Reissner-Nordström…

Quasilocal energy in modified gravity

- Physics
- 2015

A new generalization of the Hawking-Hayward quasilocal energy to scalar-tensor gravity is proposed without assuming symmetries, asymptotic flatness, or special spacetime metrics. The procedure…

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- Geology
- 2015

No-hair theorems in theories of gravity with a scalar field are briefly and critically reviewed. Their significance and limitations are discussed and potential evasions are considered.

Black hole hair formation in shift-symmetric generalised scalar-tensor gravity

- Physics
- 2016

A linear coupling between a scalar field and the Gauss-Bonnet invariant is the only known interaction term between a scalar and the metric that: respects shift symmetry; does not lead to higher order…

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