$f$-mode Oscillations for Hyperons and H-dibaryons in Neutron Stars

TL;DR

This paper investigates the fundamental oscillations of neutron stars using a relativistic model that includes hyperons and H-dibaryons, analyzing their effects on $f$-modes relevant for gravitational wave studies.

Contribution

It introduces the first inclusion of hyperons and H-dibaryons in $f$-mode analysis within a relativistic framework, exploring their impact on neutron star oscillations.

Findings

Hyperons and H-dibaryons significantly influence $f$-mode frequencies.

Universal relations are validated within the relativistic Cowling approximation.

Potential for gravitational wave asteroseismology applications is discussed.

Abstract

The fundamental ($f$-mode) oscillations of neutron stars are studied within the quark meson coupling model, a relativistic Hartree-Fock theory of dense nuclear matter, which takes into account the self-consistent modification of the valence quark structure of the bound baryons in the associated strong Lorentz scalar mean fields. For the first time, hyperons and H-dibaryons are included, along with the effects of potential additional short-range repulsion within this scheme, and their influence on $f$-modes is investigated. Universal relations are studied within the relativistic Cowling approximation and compared against those in the existing literature for potential applications in gravitational wave asteroseismology.