Charged compact objects in the linear regime

TL;DR

This paper analyzes charged anisotropic compact stars using an exact Einstein-Maxwell solution, demonstrating how charge influences mass and matching observed stellar data.

Contribution

It introduces a model for charged compact stars in the linear regime and systematically studies charge effects on observed stellar parameters.

Findings

Charge increases the mass of compact stars.

Model parameters fit observed mass-radius data.

Physical quantities remain well-behaved with charge.

Abstract

Astrophysical compact stars provide a natural laboratory for testing theoretical models which are otherwise difficult to prove from an experimental setup. In our present work we analyse an exact solution to the Einstein-Maxwell system for a charged anisotropic compact body in the linear regime. The charged parameter may be set to zero which gives us the case of neutral solutions. We have tuned the model parameters for the uncharged case so as to match with recent updated mass-radius estimates for five different compact objects. Then we make a systematic study of the effect of charge for the different parameter set that fits the observed stars. The effect of charge is clearly illustrated in the increase of mass. We show that the physical quantities for the objects PSR J1614-2230, PSR J1903+327, Vela X-1, SMC X-1, Cen X-3 are well behaved.