# The population of highly magnetized neutron stars

## TL;DR

This paper investigates how strong magnetic fields influence neutron star populations, showing that such fields limit exotic particle presence by reducing core densities, using relativistic mean field models and Einstein-Maxwell equations.

## Contribution

It introduces a detailed modeling approach combining relativistic mean field theory with magnetic field effects to study neutron star composition.

## Key findings

- Magnetic fields decrease the central density of neutron stars.
- Strong magnetic fields suppress the appearance of exotic particles.
- Neutron stars with strong magnetic fields are mainly populated by nucleons and leptons.

## Abstract

In this work, we study the effects of strong magnetic field configurations on the population of neutron stars. The stellar matter is described within a relativistic mean field formalism which considers many-body force contributions in the scalar couplings. We choose the parametrization of the model that reproduces nuclear matter properties at saturation and also describes massive hyperon stars. Hadronic matter is modeled at zero temperature, in beta-equilibrium, charge neutral and populated by the baryonic octet, electrons and muons. Magnetic effects are taken into account in the structure of stars by the solution of the Einstein-Maxwell equations with the assumption of a poloidal magnetic field distribution. Our results show that magnetic neutron stars are populated essencialy by nucleons and leptons, due to the fact that strong magnetic fields decrease the central density of stars and, hence, supress the appearance of exotic particles.