dorsal/arxiv
View SchemaPhase Structure of Compact Star in Modified Quark-Meson Coupling Model
| Authors | Chang-Qun Ma, Chun-Yuan Gao |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0612107 |
| URL | https://arxiv.org/abs/nucl-th/0612107 |
| DOI | 10.1088/0253-6102/50/1/35 |
| Journal | Commun.Theor.Phys.50: 180-186, 2008 |
Abstract
The K$^-$ condensation and quark deconfinement phase transitions are investigated in the modified quark-meson coupling model. It is shown that K$^-$ condensation is suppressed because of the quark deconfinement when $B^{1/4}<$202.2MeV, where $B$ is the bag constant for unpaired quark matter. With the equation of state (EOS) solved self-consistently, we discuss the properties of compact stars. We find that the EOS of pure hadron matter with condensed K$^-$ phase should be ruled out by the redshift for star EXO0748-676, while EOS containing unpaired quark matter phase with $B^{1/4}$ being about 180MeV could be consistent with this observation and the best measured mass of star PSR 1913+16. We then probe into the change of the phase structures in possible compact stars with deconfinment phase as the central densities increase. But if the recent inferred massive star among Terzan 5 with M$>$1.68M$_{\odot}$ is confirmed, all the present EOSes with condensed phase and deconfined phase would be ruled out and therefore these exotic phases are unlikely to appear within neutron stars.
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"abstract": "The K$^-$ condensation and quark deconfinement phase transitions are\ninvestigated in the modified quark-meson coupling model. It is shown that K$^-$\ncondensation is suppressed because of the quark deconfinement when\n$B^{1/4}\u003c$202.2MeV, where $B$ is the bag constant for unpaired quark matter.\nWith the equation of state (EOS) solved self-consistently, we discuss the\nproperties of compact stars. We find that the EOS of pure hadron matter with\ncondensed K$^-$ phase should be ruled out by the redshift for star EXO0748-676,\nwhile EOS containing unpaired quark matter phase with $B^{1/4}$ being about\n180MeV could be consistent with this observation and the best measured mass of\nstar PSR 1913+16. We then probe into the change of the phase structures in\npossible compact stars with deconfinment phase as the central densities\nincrease. But if the recent inferred massive star among Terzan 5 with\nM$\u003e$1.68M$_{\\odot}$ is confirmed, all the present EOSes with condensed phase\nand deconfined phase would be ruled out and therefore these exotic phases are\nunlikely to appear within neutron stars.",
"arxiv_id": "nucl-th/0612107",
"authors": [
"Chang-Qun Ma",
"Chun-Yuan Gao"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0253-6102/50/1/35",
"journal_ref": "Commun.Theor.Phys.50: 180-186, 2008",
"title": "Phase Structure of Compact Star in Modified Quark-Meson Coupling Model",
"url": "https://arxiv.org/abs/nucl-th/0612107"
},
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