Towards a solution of the hyperon puzzle
Towards a solution of the hyperon puzzle
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解决超子难题
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
W. Weise
中科院分区：
文献类型：
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作者：
J. Haidenbauer;U. Meissner;N. Kaiser;W. Weise
基于SU(3)手性有效场理论（EFT）推导出的超子-核子相互作用，利用Brueckner理论研究了$\Lambda$ -超子在核和中子物质中的介质性质。结果表明，当密度$\rho$为正常核物质的2 - 3倍时，所得的$\Lambda$单粒子势$U_\Lambda(p_\Lambda =0,\rho)$变得强烈排斥。加入由手性$\Lambda NN$三体力构成的密度相关的有效$\Lambda N$相互作用进一步增加了斥力。讨论了这些发现对中子星的影响。有人认为，对于具有从SU(3) EFT势推断出的性质的超子-核相互作用，预计中子星核心中超子形成的开始将转移到极高的重子密度，从而有可能解决所谓的超子难题。
Brueckner theory is used to investigate the in-medium properties of a $\Lambda$-hyperon in nuclear and neutron matter, based on hyperon-nucleon interactions derived within SU(3) chiral effective field theory (EFT). It is shown that the resulting $\Lambda$ single-particle potential $U_\Lambda(p_\Lambda =0,\rho)$ becomes strongly repulsive for densities $\rho$ of two-to-three times that of normal nuclear matter. Adding a density-dependent effective $\Lambda N$-interaction constructed from chiral $\Lambda NN$ three-body forces increases the repulsion further. Consequences of these findings for neutron stars are discussed. It is argued that for hyperon-nuclear interactions with properties such as those deduced from the SU(3) EFT potentials, the onset for hyperon formation in the core of neutron stars is expected to be shifted to extremely high baryon density, thus potentially resolving the so-called hyperon puzzle.