Fermion-charged-boson stars

TL;DR

This paper investigates fermion-charged-boson stars, extending previous models by introducing charge to the bosonic component, and analyzes their stability, mass, and size characteristics.

Contribution

It introduces charge to the bosonic field in fermion-boson stars and provides a detailed stability analysis and mass-radius relationship for these charged systems.

Findings

Charge increases maximum mass and compactness of stars.

Stable configurations exist across a range of parameters.

Charge influences the mass-radius relationship significantly.

Abstract

Fermion-boson stars are starlike systems composed of the ordinary nuclear matter of a neutron star and bosonic dark matter. The bosonic dark matter has typically been taken to be a complex scalar field. A natural extension is for the complex scalar field to be charged. We make the simplest extension and gauge the scalar field under U(1). We therefore study fermion-charged-boson stars. We make a detailed study of the stability of this system by computing critical curves over the whole of parameter space. We then study how the fermion and boson sectors contribute to the total mass of the star. Finally, we present mass-radius diagrams, showing that an increase in charge can lead to more massive and more compact stars.