Hadronic and hybrid stars subject to density dependent magnetic fields

TL;DR

This paper investigates the effects of strong magnetic fields on the structure and properties of hadronic and hybrid stars, including the impact of anomalous magnetic moments and different equations of state, to explain high-mass neutron stars.

Contribution

It introduces a comprehensive analysis of magnetars with density-dependent magnetic fields using advanced models for hadronic and quark matter, including magnetic corrections and particle abundances.

Findings

High mass neutron stars can be explained by models with strong magnetic fields.

Magnetic fields influence the equations of state and star structure significantly.

Hybrid stars with a non-linear Walecka and NJL model can match observed neutron star masses.

Abstract

In this work we present a study of magnetars composed of hadronic and quark matter, under the influence of strong magnetic fields. We present our results for hadronic matter taking into account the effects that the inclusion of anomalous magnetic moment corrections may cause on the equations of state (EOS). Particle abundances are also presented and discussed. Additionally, the case of hybrid stars under the influence of strong magnetic fields is considered. We study the structure of hybrid stars based on the Maxwell condition (without a mixed phase), where the hadron phase is described by the non-linear Walecka model (NLW) and the quark phase by the Nambu-Jona-Lasinio model (NJL). The EOS and the mass-radius relation for each case are calculated and discussed. We show that the recently observed high mass neutron stars can be described by both hadronic and hybrid equations of state subject to strong magnetic fields.