Phase Structure of Compact Star in Modified Quark-Meson Coupling Model

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.

11 pages, 5 figures

References in corpus (8)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The Physics of Neutron Stars
• EXO 0748-676 Rules out Soft Equations of State for Neutron Star Matter
• Twenty-One Millisecond Pulsars in Terzan 5 Using the Green Bank Telescope
• Quark matter in compact stars?
• Kaon condensation in the quark-meson coupling model and compact stars
• The Shapes of Atomic Lines from the Surfaces of Weakly Magnetic Rotating Neutron Stars and Their Implications
• Thermal kaons production in the relativistic heavy ions collision

Cited by in corpus (1)

• Effects of phase transition in hybrid stars from quark-meson coupling hadronic matter to deconfined quark matter