$U(1)$ gauged boson stars in the Einstein-Friedberg-Lee-Sirlin model

TL;DR

This paper investigates spherically symmetric $U(1)$ gauged boson stars within the Friedberg-Lee-Sirlin model, revealing how their properties vary with the strength of gravity and electromagnetic interactions, bridging behaviors of ungauged boson stars and gauged Q-balls.

Contribution

It introduces a detailed analysis of gauged boson stars in a two-component scalar model, highlighting the influence of gravity and electromagnetic interactions on their properties.

Findings

Boson stars exhibit properties of ungauged or gauged Q-balls depending on interaction strengths.

Behavior varies with the relative strength of gravity and electromagnetic forces.

The model connects properties of boson stars and gauged Q-balls in a unified framework.

Abstract

We consider spherically symmetric $U(1)$ gauged boson stars in the two-component scalar Friedberg-Lee-Sirlin model with a symmetry breaking potential in 3+1 dimensional spacetime. Depending on the relative strength of gravity and the electromagnetic interaction, the resulting boson stars exhibit either the typical properties of ungauged boson stars, or their behavior resembles the pattern found for gauged Q-balls of the Friedberg-Lee-Sirlin model in flat spacetime, both for a finite and a vanishing potential.