CPOD International Workshop at GSI Darmstadt
July 9 - 13, 2007 -
Registered Participants Information

Title:	Dr.
Last Name:	Gao
First Name:	Chun-Yuan
E-Mail:	gaocypku.edu.cn
Affiliation for Badge:	Peking University, Beijing
Institute:	School of Physics
Address (Street):	No. 5 Yiheyuan Road
Postal Code, City:	Beijing 100871
Country:	China
Phone:	86-10-62759786
Fax:	86-10-62751615
Arrival Date:	July 9
Departure Date:	July 13
Hotel Information:	Others...
Payment:	Cash at the conference site
Contribution
Author(s):	Chang-Qun Ma and Chun-Yuan Gao
Institute(s):	School of Physics, Peking University, Beijing 100871, China
Title:	Phase Structures of Compact Stars in the 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.