Repulsive properties of hadrons in lattice QCD data and neutron stars
Repulsive properties of hadrons in lattice QCD data and neutron stars
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晶格 QCD 数据和中子星中强子的排斥特性
DOI：
10.1103/physrevc.103.054908
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发表时间：
2020
影响因子：
3.1
通讯作者：
H. Stoecker
中科院分区：
文献类型：
--
作者：
A. Motornenko;Somenath Pal;A. Bhattacharyya;J. Steinheimer;H. Stoecker
在CMF模型中计算了$B$、$Q$和$S$电荷的二阶极化率，并与已有的晶格QCD数据进行了比较。结果表明，磁化率对不同强子物种之间的短程排斥相互作用非常敏感，特别是对不受约束的超子核心排斥非常敏感。与非奇异重子相比，超子尺寸的减小显著提高了CMF模型与格子QCD数据的一致性。电荷相关的磁化率对介子的短程排斥体积很敏感。我们与晶格QCD数据的比较表明，奇异重子、非奇异介子和奇异介子的核心体积都比非奇异重子小得多。在修正的强子体积模型中，QCD磁化率的主要强子描述在手征准临界温度以上是可能的。
基于晶格QCD数据，用改进的CMF模型研究了冷QCD物质和中子星物质的性质。虽然相结构基本不变，即手性相变只发生在低温下(约17 MeV)，但超子在去禁闭到更高的密度时比非奇异强子存活。由于超子的出现，中子星的质量-半径图只作了轻微的修改，仍然与天体物理观测相一致。
The second order susceptibilities of $B$, $Q$, and $S$ charges, $\chi^{11}_{ij}$, are calculated in the CMF model and compared to the available lattice QCD data. It is found that the susceptibilities are very sensitive to the short range repulsive interactions between different hadron species, especially to the not so well constrained hardcore repulsion of hyperons. A decrease of the hyperons size, as compared to the non-strange baryons, significantly improves the agreement of the CMF model results with the Lattice QCD data. The electric charge dependent susceptibilities are sensitive on the short range repulsive volume of mesons. Our comparison with lattice QCD data suggests that strange baryons, non-strange mesons and strange mesons have significantly smaller hardcore volume than non-strange baryons. With the modified hadron volumes in the model, a mainly hadronic description of the QCD susceptibilities is possible significantly above the chiral pseudo-critical temperature.
The improved CMF model, based on the lattice QCD data, has been used to study the properties of cold QCD matter and neutron star matter. While the phase structure is essentially unchanged, i.e. the chiral phase transition occurs only at low temperatures ($T_{\rm CP}\approx 17$ MeV), hyperons survive deconfinement to higher densities than non-strange hadrons. The neutron star mass-radius diagram is only modified slightly due to the appearance of hyperons and still is in agreement with astrophysical observations.
影响因子：
4.4
作者：
Borsanyi, Szabolcs;Fodor, Zoltan;Szabo, Kalman K.
通讯作者：
Szabo, Kalman K.