Star-plus-wormhole systems with two interacting scalar fields

TL;DR

This paper investigates static, spherically symmetric systems combining wormholes with neutron fluids, revealing that such configurations can have double-throat structures and shifted density maxima.

Contribution

It introduces new solutions for mixed wormhole-neutron star systems with interacting ghost scalar fields, highlighting their unique geometric features.

Findings

Configurations are regular and asymptotically flat.

Maximum fluid density is shifted from the center.

Systems generally exhibit double-throat structures.

Abstract

We study static, spherically symmetric mixed configurations with a nontrivial (wormhole) spacetime topology provided by the presence of two interacting ghost scalar fields. Wormhole is assumed to be filled by a perfect relativistic neutron fluid modeled by a polytropic equation of state. For such mixed configurations, we find regular, asymptotically flat general relativistic solutions. It is shown that the maximum of the fluid density is always shifted from the center, and the resulting configurations represent, in general, double-throat systems.