Work

Nonlinear evolution in extended scalar-Gauss-Bonnet gravity

Year: 2025

Type: conference-paper

Abstract: Scalar-Gauss-Bonnet (sGB) gravity with a coupling between the scalar field and the Ricci scalar displays interesting properties, including black hole stability, agreement with the binary pulsar constraints, and compatibility with general relativity as a cosmological late-time attractor. Previous studies have shown that spherical collapse in this framework is well-posed over a wide parameter range. Here, we extend this analysis to examine 3 + 1 evolution for static and rotating black holes, confirming that the evolution remains hyperbolic if the weak coupling condition is not strongly violated. Hyperbolicity loss is linked to the gravitational sector of the physical modes, rather than the gauge choice. Our results also indicate that stationary, near-extremal scalarized black holes may exist in the Ricci-coupled sGB theory for a large enough region of the parameter space with the scalar field sourced by the spacetime curvature instead of the black hole spin.

Source: Journal of Physics Conference Series

DOI: 10.1088/1742-6596/3002/1/012001

Authors: Daniela D. Doneva, Llibert Aresté Saló, Stoytcho S. Yazadjiev

Institutions: University of Tübingen, Queen Mary University of London, Bulgarian Academy of Sciences, Institute of Mathematics and Informatics, Sofia University "St. Kliment Ohridski"

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W4410153336

FWCI: 9.555

Cites: 51

Cited by: 1

Related to: 10