g-mode Oscillations in Neutron Stars with Hyperons

TL;DR

This paper investigates how the presence of hyperons in neutron star cores affects g-mode oscillation frequencies, suggesting that future observations could confirm hyperonic matter in neutron stars.

Contribution

It provides the first detailed analysis of g-mode oscillations in neutron stars with hyperons using relativistic mean field models that meet observational constraints.

Findings

G-mode frequencies sharply increase with hyperon onset

Hyperonic matter significantly influences neutron star oscillation spectra

Future g-mode observations could detect hyperons in neutron star cores

Abstract

A common alternative to the standard assumption of nucleonic composition of matter in the interior of a neutron star is to include strange baryons, particularly hyperons. Any change in composition of the neutron star core has an effect on g-mode oscillations of neutron stars, through the compositional dependence of the equilibrium and adiabatic sound speeds. We study the core g-modes of a neutron star contaning hyperons, using a variety of relativistic mean field models of dense matter that satisfy observational constraints on global properties of neutron stars. Our selected models predict a sharp rise in the g-mode frequencies upon the onset of strange baryons. Should g-modes be observed in the near future, their frequency could be used to test the presence of hyperonic matter in the core of neutron stars.