Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars

Bao Temurbagan; LIU Guang-Zhou; ZHU Ming-Feng; LIU Wei

Chinese Physics C> 2006, Vol. 30> Issue(10) : 961-965

Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars

College of Physics, Jilin University, Changchun 130023, China2 College of Physics, Inner Mongolia University for Nationalities, Tongliao 028043, China

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Abstract：
In terms of the relativistic mean field theory, which describes the hadronic matter, and the NJL model, which characterizes the quark matter, the influence of hyperon coupling constant on the properties of hybrid stars is studied. The numerical results show that with the increase of the hyperon coupling constant the phase transition density decreases, the equation of state in the mixed phase range stiffens, and the maximum mass and the corresponding radius increase. When the hyperon coupling constant increases from 0.73 to 1, the maximum mass of the star increases from 1.68_⊙ to 1.82M_⊙ and the corresponding radius of the star changes from 11.4km to 12.5km. The result also shows that the different hadronic equations of state have different influence on the properties hybrid stars. This model is suitable for describing the hybrid stars with big masses and small quark cores.

References

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Bao Temurbagan, LIU Guang-Zhou, ZHU Ming-Feng and LIU Wei. Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars[J]. Chinese Physics C, 2006, 30(10): 961-965.

Bao Temurbagan, LIU Guang-Zhou, ZHU Ming-Feng and LIU Wei. Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars[J]. Chinese Physics C, 2006, 30(10): 961-965. shu

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Received: 2006-01-19
Revised: 2006-02-08

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars

Corresponding author: LIU Guang-Zhou,

College of Physics, Jilin University, Changchun 130023, China2 College of Physics, Inner Mongolia University for Nationalities, Tongliao 028043, China

Received Date: 2006-01-19
Accepted Date: 2006-02-08
Available Online: 2006-10-05

Abstract: In terms of the relativistic mean field theory, which describes the hadronic matter, and the NJL model, which characterizes the quark matter, the influence of hyperon coupling constant on the properties of hybrid stars is studied. The numerical results show that with the increase of the hyperon coupling constant the phase transition density decreases, the equation of state in the mixed phase range stiffens, and the maximum mass and the corresponding radius increase. When the hyperon coupling constant increases from 0.73 to 1, the maximum mass of the star increases from 1.68_⊙ to 1.82M_⊙ and the corresponding radius of the star changes from 11.4km to 12.5km. The result also shows that the different hadronic equations of state have different influence on the properties hybrid stars. This model is suitable for describing the hybrid stars with big masses and small quark cores.