Axial Quasi-normal modes of Neutron Stars with Exotic Matter

TL;DR

This paper studies how exotic matter like hyperons and quarks affect neutron star oscillation modes, introducing a new computational method to identify differences in their quasi-normal modes.

Contribution

It presents a novel Exterior Complex Scaling method for accurately computing neutron star quasi-normal modes considering exotic matter effects.

Findings

w-modes differ between stars with and without exotic matter

The method accurately generates pure outgoing modes

Exotic matter influences neutron star oscillation spectra

Abstract

We investigate the axial w quasi-normal modes of neutron stars for 18 realistic equations of state in order to study the influence of hyperons and quarks on the modes. The study has been developed with a new method based on Exterior Complex Scaling with variable angle, which allow us to generate pure outgoing quasi-normal modes. A complete study of the junction conditions has been done. We have obtained that w-modes can be used to distinguish between neutron stars with exotic matter and without exotic matter for compact enough stars.