Phase Transitions in Neutron Stars Within Modified Quark-Meson Coupling Model

摘要

K- condensation and quark deconfinement phase transitions in neutron stars are investigated.We use the modified quark-meson coupling model for hadronic phase and the MIT bag model for quark phase.With the equation of state (EOS) solved self-consistently,we discuss the properties of neutron stars.We find that the EOS of pure hadron matter with condensed K- phase should be ruled out by the redshift for star EX00748-676,while EOS containing unpaired quark matter phase with B1/4 being about 180 MeV could be consistent with both this observation and the best measured mass of star PSR 1913 +16.But if the recent inferred massive star among Terzan 5 with M > 1.68M⊙ is confirmed,all the present EOSes with condensed phase and deconfined phase would be ruled out.