Quark-Pauli effects in three octet-baryons

TL;DR

This paper investigates quark-Pauli effects in three-octet-baryon systems to understand their impact on hyperon appearance in neutron star cores, revealing varying repulsive effects among different hyperons.

Contribution

It provides a detailed analysis of quark-Pauli repulsion effects in three-baryon systems, highlighting differences between $ ext{Lambda}$ and $ ext{Sigma}^-$ hyperons in dense matter.

Findings

Weak Pauli blocking in $ ext{Lambda}nn$ system

Strong Pauli blocking in $ ext{Sigma}^-nn$ system

Suppression of $ ext{Sigma}^-$ hyperon in neutron stars

Abstract

To sustain a neutron star with about two times the solar mass, multi baryons including hyperons are expected to produce repulsive effects in the interior of its high baryon-density region. To examine possible quark-Pauli repulsion among the baryons, we solve the eigenvalue problem of the quark antisymmetrizer for three octet-baryons that are described by most compact spatial configurations. We find that the Pauli blocking effect is weak in the $\Lambda nn$ system, while it is strong in the $\Sigma^-nn$ system. The appearance of the $\Sigma^-$ hyperon is suppressed in the neutron star interior but no quark-Pauli repulsion effectively works for the $\Lambda$ hyperon.