Numerical Black Hole Solutions in Modified Gravity Theories: Axial Symmetry Case
Abstract
We extend a recently developed numerical code to obtain stationary, axisymmetric solutions that describe rotating black hole spacetimes in a wide class of modified theories of gravity. The code utilizes a relaxed Newton-Raphson method to solve the full nonlinear modified Einstein's Equations on a two-dimensional grid with a Newton polynomial finite difference scheme. We validate this code by considering static and axisymmetric black holes in General Relativity. We obtain rotating black hole solutions in scalar-Gauss-Bonnet gravity with a linear (linear scalar-Gauss-Bonnet) and an exponential (Einstein-dilaton-Gauss-Bonnet) coupling and compare them to analytical and numerical perturbative solutions. From these numerical solutions, we construct a fitted analytical model and study observable properties calculated from the numerical results.
Keywords
Cite
@article{arxiv.2009.10614,
title = {Numerical Black Hole Solutions in Modified Gravity Theories: Axial Symmetry Case},
author = {Andrew Sullivan and Nicolás Yunes and Thomas P. Sotiriou},
journal= {arXiv preprint arXiv:2009.10614},
year = {2021}
}