Some new Wyman-Adler type static relativistic charged anisotropic fluid spheres compatible to self-bound stellar modeling

TL;DR

This paper develops new models of charged anisotropic relativistic stars using Einstein-Maxwell equations, providing insights into maximum mass and compactness, applicable to strange star candidates.

Contribution

It introduces a systematic method for modeling charged anisotropic stars with specific metric potentials and charge distributions, extending previous work on relativistic stellar structures.

Findings

Electric charge significantly increases maximum mass and compactness.

Models can fit observed properties of known strange star candidates.

The equation of state supports self-bound strange star configurations.

Abstract

In this work some families of relativistic anisotropic charged fluid spheres have been obtained by solving Einstein-Maxwell field equations with preferred form of one of the metric potentials, a suitable forms of electric charge distribution and pressure anisotropy functions. The resulting equation of state (EOS) of the matter distribution has been obtained. Physical analysis shows that the relativistic stellar structure for matter distribution obtained in this work may reasonably model an electrically charged compact star whose energy density associated with the electric fields is on the same order of magnitude as the energy density of fluid matter itself (e.g. electrically charged bare strange stars). These models permit a simple method of systematically fixing bounds on the maximum possible mass of cold compact electrically charged self-bound stars. It has been demonstrated numerically that the maximum compactness and mass increase in the presence of electric field and anisotropic pressures. Based on the analytic model developed in this present work, the values of the relevant physical quantities have been calculated by assuming the estimated masses and radii of some well known potential strange star candidates like PSR J1614-2230, PSR J1903+327, Vela X-1, and 4U 1820-30.