Dyonic regular black bounce solutions in General Relativity

TL;DR

This paper introduces new dyonic black bounce solutions in General Relativity coupled with nonlinear electrodynamics and scalar fields, including the first solution with a linear electromagnetic Lagrangian, expanding the landscape of non-singular black hole geometries.

Contribution

It presents the first black bounce solution derived from a linear electromagnetic Lagrangian coupled with a scalar field, incorporating both electric and magnetic charges.

Findings

Analyzed horizons and metric behavior of dyonic solutions.

Ensured spacetime regularity via Kretschmann scalar analysis.

Broadened non-singular geometry classes in GR.

Abstract

This work explores dyonic black bounce (BB) solutions within the framework of General Relativity (GR), coupled with nonlinear electrodynamics (NLED) and scalar fields (SFs). Previous research has employed NLED and SFs to obtain BB solutions in GR; however, these solutions typically assume the presence of either magnetic monopoles or electric charges exclusively as components of the Maxwell-Faraday tensor. In this study, we examine static and spherically symmetric BB solutions that incorporate both magnetic and electric components, forming what are known as dyon solutions. A dyon is a particle characterized by the coexistence of both magnetic and electric charges. We determine the NLED Lagrangian density and the scalar field potential that produce these solutions and analyze the associated gravitational configurations, focusing on horizons, the behavior of the metric function, and spacetime regularity as described by the Kretschmann scalar. Notably, we present the first BB solution derived from the coupling of a linear electromagnetic Lagrangian and a scalar field with an associated potential as the matter source. This work broadens the class of non-singular geometries in the literature and opens new avenues for investigating dyonic BB solutions within the context of other modified gravity theories.