Analytical approximate solutions of AdS black holes in Einstein-Weyl-scalar gravity

TL;DR

This paper derives analytical approximate solutions for AdS black holes in Einstein-Weyl-scalar gravity using the MGD approach and HAM, providing accurate descriptions of scalar fields and metric deformations.

Contribution

It introduces a novel combination of MGD and HAM to obtain approximate solutions for Einstein-Weyl-scalar black holes, which was not previously achieved.

Findings

Analytical solutions are accurate throughout the exterior spacetime.

The method effectively decomposes complex field equations into manageable subsystems.

Fourth-order approximations provide sufficient precision for physical analysis.

Abstract

We consider Einstein-Weyl gravity with a minimally coupled scalar field in four dimensional spacetime. By using the Minimal Geometric Deformation (MGD) approach, we split the highly nonlinear coupled field equations into two subsystems that describing the background geometry and scalar field source, respectively. Regarding the Schwarzschild-AdS metric as a background geometry, we derive analytical approximate solutions of scalar field and deformation metric functions with Homotopy Analysis Method (HAM), providing their analytical approximations to fourth order. Moreover, we discuss the accuracy of the analytical approximations, showing they are sufficiently accurate throughout the exterior spacetime.