Hyperon coupling dependence of hadron matter properties in relativistic mean field model |
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| Authors: | Mi Ai-Jun Zuo Wei and Li Ang |
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| Affiliation: | School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China: Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China: School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; |
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| Abstract: | The properties of hadronic matter at $\beta$equilibrium in a wide range of densities are described by appropriate equations of state in the framework of the relativistic mean field model. Strange meson fields, namely the scalar meson field $\sigma$* (975) and the vector meson field $\phi$(1020), are included in the present work. We discuss and compare the results of the equation of state, nucleon effective mass, and strangeness fraction obtained by adopting the TM1, TMA, and GL parameter sets for nuclear sector and three different choices for the hyperon couplings. We find that the parameter set TM1 favours the onset of hyperons most, while at high densities the GL parameter set leads to the most hyperon-rich matter. For a certain parameter set (e.g. TM1), the most hyperon-rich matter is obtained for the hyperon potential model. The influence of the hyperon couplings on the effective mass of nucleon, is much weaker than that on the nucleon parameter set. The nonstrange mesons dominate essentially the global properties of dense hyperon matter. The hyperon potential model predicts the lowest value of the neutron star maximum mass of about 1.45Msunto be 0.4-0.5Msunlower than the prediction by using the other choices for hyperon couplings. |
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| Keywords: | hyperon coupling strange meson field equations of state |
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