Radial Stability of Charged Interacting Quark Stars Revisited

Abstract

An error in the charged quark star literature \cite{Goncalves:2020joq} has resulted in erroneous solutions to the radial stability equations for charged interacting quark stars in \cite{zhang:2021}. In this article we recalculate the fundamental radial eigenfrequencies for charged, interacting quark stars in general relativity and discuss any departure from previous results \cite{zhang:2021}. Most of the qualitative trends persist, but the magnitudes of the separation between the maximum mass and stability points on a given branch can change significantly. We also note that all branches in \cite{zhang:2021} that contained no stable solutions now have stable solutions in their corrected counterparts. The net effect is that in all of the studied cases charged quark stars have a greater range of stability than originally predicted. We also compare four recent observational constraints not included in previous studies, and find that these constraints are satisfied by a subset of the mass-radius relations we obtain.

arXiv commentCorrects arXiv:2108.13972