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The influences of hyperon-hyperon interaction on the overall properties of hadronic star are investigated in the framework of relativistic mean field (RMF) theory. For certain hyperon coupling, the weaker hyperon-hyperon interaction can lead to the heavier hadronic star, which accords with the observation of heavy neutron star in X-ray binaries. We find that the threshold densities of the hyperons with larger masses are brought to a lower values with the increase of the hyperon-hyperon interaction. The possibility of the existence of hyperon star is checked with the consideration of hyperon-hyperon interaction. 相似文献
2.
By using the new experimental data of \Lambda\Lambda potential,
this paper has performed a full calculation for strange hadronic
matter with different strangeness contents as well as its
consequences on the global properties of neutron star matter in
relativistic mean field model. It finds that the new weak
hyperon--hyperon interaction makes the equations of state much
stiffer than the result of the previous strong hyperon--hyperon
interaction, and even stiffer than the result without consideration
of hyperon--hyperon interaction. This new hyperon--hyperon
interaction results in a maximum mass of 1.75M_{\odot} (where
M_{\odot} stands for the mass of the Sun), about
0.2--0.5M_{\odot} larger than the previous prediction with
the presence of hyperons. After examining carefully the onset
densities of kaon condensation it finds that this new weak version of
hyperon--hyperon interaction favours the occurrence of kaons in
comparison with the strong one. 相似文献
3.
The properties of hadronic matter at β 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 σ*(975) and the vector meson field φ(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 hypcron 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 1.45 Msun to be 0.4--0.5 Msun lower than the prediction by using the other choices for hyperon couplings.[第一段] 相似文献
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