Hyperon--hyperon interaction in relativistic mean field model
Li Ang(李昂)a)b)†, Zuo Wei(左维)a)b), Mi Ai-Jun(米爱军)b), and Burgio Gc)
a Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; b School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; c INFN Sezione di Catania, Via Santa Sofia 64, I- 95123 Catania, Italy 060853
Abstract 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.
Received: 22 September 2006
Revised: 20 October 2006
Accepted manuscript online:
Fund: Project supported by the
National Natural Science Foundation of China (Grant Nos 10575119
and 10235030), the Knowledge Innovation Project (Grant No
KJCX2-SW-N02) of Chinese Academy of Sciences, the Major State
Basic Research Development Program of China (
Cite this article:
Li Ang(李昂), Zuo Wei(左维), Mi Ai-Jun(米爱军), and Burgio G Hyperon--hyperon interaction in relativistic mean field model 2007 Chinese Physics 16 1934
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