Magnetic fields in mixed neutron-star-plus-wormhole systems

TL;DR

This paper investigates how the presence of a wormhole affects magnetic field distribution in neutron-star-plus-wormhole systems, revealing new density configurations but also indicating their instability.

Contribution

It introduces mixed neutron-star-plus-wormhole models with magnetic fields and analyzes their stability and density profiles, highlighting the impact of topology and anisotropy.

Findings

New solutions with shifted density maxima for anisotropic fluids

Mixed configurations are found to be linearly unstable

Magnetic field distribution is influenced by nontrivial topology

Abstract

We consider mixed configurations consisting of a wormhole filled by a strongly magnetized isotropic or anisotropic neutron fluid. The nontrivial topology of the spacetime is allowed by the presence of exotic matter. By comparing these configurations with ordinary magnetized neutron stars, we clarify the question of how the presence of the nontrivial topology influences the magnetic field distribution inside the fluid. In the case of an anisotropic fluid, we find new solutions describing configurations, where the maximum of the fluid density is shifted from the center. A linear stability analysis shows that these mixed configurations are unstable.