Excluded-volume model for quarkyonic matter. II. Three-flavor shell-like distribution of baryons in phase space

Duarte, Dyana C.; Hernandez-Ortiz, Saul; Jeong, Kie Sang

doi:10.1103/physrevc.102.065202

Excluded-volume model for quarkyonic matter. II. Three-flavor shell-like distribution of baryons in phase space

Journal Article · Fri Dec 04 00:00:00 EST 2020 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.102.065202· OSTI ID:1849334

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Univ. of Washington, Seattle, WA (United States); OSTI
Univ. of Washington, Seattle, WA (United States)

We extend the excluded-volume model of isospin symmetric two-flavor dense quarkyonic matter [Phys. Rev. C 101, 035201 (2020)] including strange particles and address its implications for neutron stars. The effective sizes of baryons are defined from the diverging hard-core potentials in the short interdistance regime. Around the hard-core density, the repulsive core between baryons at short distances leads to a saturation in the number density of baryons and generates perturbative quarks from the lower phase space, which leads to the shell-like distribution of baryons by the Pauli exclusion principle. The strange-quark Fermi sea always appears at high densities but the Λ hyperon shell only appears when the effective size of the Λ hyperon is smaller than the effective size of nucleons. We find that the pressure of strange quarkyonic matter can be large enough to support neutron stars with two times solar mass and can have a large sound speed, $$c^2_s ≃ 0.7$$. Finally, the fraction of the baryon number carried by perturbative quarks is about 30% at the inner core of most massive neutron stars.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: Simons Foundation; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-00ER41132

OSTI ID:: 1849334

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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