Eur. Phys. J. A (2008) 38: 287-293
https://doi.org/10.1140/epja/i2008-10682-6

Regular Article - Theoretical Physics

Self-consistently thermodynamic treatment for strange quark matter in the effective mass bag model

¹ College of Physics, Jilin University, 130023, Changchun, China
² Institute of Physics and Electronic Engineering, Nan Yang Normal University, 473061, Nanyang, China
³ Institute of Theoretical Physics, Chinese Academy of Science, 100080, Beijing, China

^* e-mail: lgz@jlu.edu.cn

Received: 20 June 2008
Revised: 17 September 2008
Accepted: 4 November 2008
Published online: 25 November 2008

Abstract

In the framework of the effective mass bag model (EMBM) we have performed the thermodynamical treatment for strange quark matter (SQM) self-consistently, which overcomes the inconsistencies in the thermodynamical properties of the system. Because of the existence of the pressure extra term, the SQM equation of state (EOS) becomes stiffer comparing with the one for the original EMBM. It is interesting to find that in our treatment the SQM EOS is almost independent of the strong coupling constant g . In this case the SQM EOS seems to get back to the EOS for the original MIT bag model. However, this treatment still has influence on the EOS for hybrid star matter and the corresponding mass-radius relations. With the increase of the strong coupling constant g , the EOS for hybrid star matter gets obviously stiff. From our treatment we notice that the pressure extra term can make a hybrid star more compact than the one described in the original EMBM and this model is more suitable to describe the hybrid stars with small radii.