Optical images of massive boson stars with nonlinear electrodynamics

Abstract

This study investigates the optical imaging characteristics of massive boson stars based on a model with Einstein's nonlinear electrodynamics. Under asymptotically flat boundary conditions, the field equations are solved numerically to obtain the spacetime metric of the massive boson stars. Employing the ray-tracing method, we analyze the optical images of the massive boson stars under two illumination conditions: a celestial light source and a thin accretion disk. The research reveals that the configurations and optical images of the massive boson stars can be tuned via the initial parameter $\phi_0$ and the coupling constant $\Lambda$. The absence of the event horizon in the massive boson stars results in distinct optical image characteristics compared to those of black holes.