A Neutron Star with a Strange Quark Star-like Mass-Radius Relation

Abstract

We study the structure of spherically symmetric and static objects in the presence of a nonminimally coupled scalar field having a potential of the form $V(\varphi )=-{\mu }^2{\varphi }^2/2+\lambda {\varphi }^4/4$. We numerically solve equations of the system using two different realistic equations of state for neutron matter and give the mass-radius relations as well as the radial profiles of the scalar field, densities and the mass function for a sample configuration. We show that a specific solution type encountered in such systems causes characteristic neutron star mass-radius relations to turn into the ones belonging to strange quark stars.

8 pages, 2 figures

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