Quark-Pauli effects in three octet-baryons

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 $Λnn$ system, while it is strong in the $Σ^-nn$ system. The appearance of the $Σ^-$ hyperon is suppressed in the neutron star interior but no quark-Pauli repulsion effectively works for the $Λ$ hyperon.

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