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EQUATION OF STATE FOR NEUTRON STARS WITH HYPERONS AND QUARKS IN THE RELATIVISTIC HARTREE-FOCK APPROXIMATION

Authors
Miyatsu, TsuyoshiCheoun, Myung-KiSaito, Koichi
Issue Date
10-Nov-2015
Publisher
IOP PUBLISHING LTD
Keywords
dense matter; elementary particles; equation of state; stars: neutron
Citation
ASTROPHYSICAL JOURNAL, v.813, no.2
Journal Title
ASTROPHYSICAL JOURNAL
Volume
813
Number
2
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/8579
DOI
10.1088/0004-637X/813/2/135
ISSN
0004-637X
Abstract
We construct the equation of state (EoS) for neutron stars explicitly including hyperons and quarks. Using the quark-meson coupling model with the relativistic Hartree-Fock approximation, the EoS for hadronic matter is derived by taking into account the strange (sigma* and phi) mesons as well as the light non-strange (sigma, omega, pi, and rho) mesons. Relevant coupling constants are determined to reproduce the experimental data of nuclear matter and hypernuclei in SU(3) flavor symmetry. For quark matter, we employ the MIT bag model with a one-gluon-exchange interaction, and Gibbs criteria for chemical equilibrium in the phase transition from hadrons to quarks. We find that the strange vector (phi) meson and the Fock contribution make the hadronic EoS stiff, and that the maximum mass of a neutron star can be consistent with the observed mass of heavy neutron stars even if the coexistence of hadrons and quarks takes place in the core. However, in the present calculation, the transition to pure quark matter does not occur in stable neutron stars. Furthermore, the lower bound of the critical chemical potential of the quark-hadron transition at zero temperature turns out to be around 1.5 GeV in order to be consistent with the recent observed neutron-star data.
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