Possibility of conversion of neutron star to quark star in presence of high magnetic field

TL;DR

This paper investigates how extremely strong magnetic fields in neutron stars influence their potential transition into quark stars, highlighting effects on the phase transition process and magnetic field evolution.

Contribution

It introduces the impact of high magnetic fields on the NS to QS transition, including modifications to the equation of state and the dynamics of the conversion process.

Findings

Magnetic fields extend the density range for phase transition.

Magnetic fields facilitate the initiation of the conversion process.

The magnetic field decreases during the transition, resulting in a quark star with lower magnetic field.

Abstract

Recent results and data suggests that high magnetic field in neutron stars (NS) strongly affects the characteristic (radius, mass) of the star. They are even separated as a class known as magnetars, for whom the surface magnetic field are greater than $10^{14}$ G. In this work we discuss the effect of such high magnetic field on the phase transition of NS to quark star (QS). We study the effect of magnetic field on the transition from NS to QS including the magnetic field effect in equation of state (EoS). The inclusion of the magnetic field increases the range of baryon number density, for which the flow velocities of the matter in the respective phase are finite. The magnetic field helps in initiation of the conversion process. The velocity of the conversion front however decreases due to the presence of magnetic field, as the presence of magnetic field reduces the effective pressure (P). The magnetic field of the star gets decreased by the conversion process, and the resultant QS has lower magnetic field than that of the initial NS.