Investigation of the rotation effects on high--density matter in hybrid stars

TL;DR

This paper investigates how rotation influences the properties of high-density matter in hybrid stars, highlighting the importance of rotation effects on the equation of state and stellar characteristics.

Contribution

It provides new insights into the impact of rotation on the EOS of hybrid stars and identifies which EOS models align with recent observational constraints.

Findings

One EOS is consistent with observations, another is not.

Rotation significantly affects the radius of hybrid stars.

A key relation between star radius and rotation rate is established.

Abstract

The equation of state (EOS) of high-density matter is still not clear and several recent observations indicate restrictions to EOSs. Theoretical studies should thus elucidate EOSs at high density and/or high temperature. Many theoretical studies have attempted to account for the effect of rotation of rapidly rotating neutron stars (pulsars), which are commonly observed astronomical objects having high-density interiors. Furthermore, neutron stars generate a strong magnetic field. Several recent studies indicate that this magnetic field exerts some restrictions on the EOS. Theoretical studies should thus incorporate these effects. In this paper, we focus on the effect of rotation. We find that one of our EOSs is consistent with these observations, and another is inconsistent. We also find an important relation between radius and rotation.