Properties of hybrid stars in an extended MIT bag model

BAO Tmurbagan; LIU Guang-Zhou; ZHU Ming-Feng

doi:10.1088/1674-1137/33/5/004

Chinese Physics C> 2009, Vol. 33> Issue(5) : 340-344 DOI: 10.1088/1674-1137/33/5/004

Properties of hybrid stars in an extended MIT bag model

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The properties of hybrid stars are investigated in the framework of the relativistic mean field theory (RMFT) and an MIT bag model with density-dependent bag constant to describe the hadron phase (HP) and quark phase (QP), respectively. We find that the density-dependent B(ρ) decreases with baryon density ρ; this decrement makes the strange quark matter become more energetically favorable than ever, which makes the threshold densities of the hadron-quark phase transition lower than those of the original bag constant case. In this case, the hyperon degrees of freedom can not be considered. As a result, the equations of state of a star in the mixed phase (MP) become softer whereas those in the QP become stiffer, and the radii of the star obviously decrease. This indicates that the extended MIT bag model is more suitable to describe hybrid stars with small radii.

References

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BAO Tmurbagan, LIU Guang-Zhou and ZHU Ming-Feng. Properties of hybrid stars in an extended MIT bag model[J]. Chinese Physics C, 2009, 33(5): 340-344. doi: 10.1088/1674-1137/33/5/004

BAO Tmurbagan, LIU Guang-Zhou and ZHU Ming-Feng. Properties of hybrid stars in an extended MIT bag model[J]. Chinese Physics C, 2009, 33(5): 340-344. doi: 10.1088/1674-1137/33/5/004 shu

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Received: 2008-08-28
Revised: 2008-12-23

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Properties of hybrid stars in an extended MIT bag model

Received Date: 2008-08-28

Accepted Date: 2008-12-23

Available Online: 2009-05-05

Abstract: The properties of hybrid stars are investigated in the framework of the relativistic mean field theory (RMFT) and an MIT bag model with density-dependent bag constant to describe the hadron phase (HP) and quark phase (QP), respectively. We find that the density-dependent B(ρ) decreases with baryon density ρ; this decrement makes the strange quark matter become more energetically favorable than ever, which makes the threshold densities of the hadron-quark phase transition lower than those of the original bag constant case. In this case, the hyperon degrees of freedom can not be considered. As a result, the equations of state of a star in the mixed phase (MP) become softer whereas those in the QP become stiffer, and the radii of the star obviously decrease. This indicates that the extended MIT bag model is more suitable to describe hybrid stars with small radii.

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Properties of hybrid stars in an extended MIT bag model

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Properties of hybrid stars in an extended MIT bag model

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