arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0709.2596nucl-th
收藏

手征对称性、禁闭与核物质性质

Chiral symmetry, Confinement and Nuclear Matter properties

G. Chanfray, M. Ericsson, E. Massot

摘要:

讨论了自发手征对称性破缺和核子子结构等QCD基本性质对核物质性质的可能影响。我们提出了一个手征形式的相对论性$σ-ω$模型,其中吸引背景标量场与控制夸克凝聚体径向涨落的手征不变场相关联。一旦核子的标量响应取决于夸克约束机制被适当地纳入,核物质的稳定性就得到了保证。所需的参数估计从晶格的结果和一个令人满意的描述散装性能如下,唯一真正自由的参数是$ωNN$耦合常数。π介子环也可以被合并,以一致的方式获得有限密度手征极化率。一旦包含完整的ρ介子交换和Fock项,就可以很好地描述不对称能量。

英文摘要:

We discuss the possible influence of fundamental QCD properties such as spontaneous chiral symmetry breaking and nucleon substructure on nuclear matter properties. We propose a chiral version of the relativistic $σ-ω$ model in which the attractive background scalar field is associated with the chiral invariant field governing the radial fluctuations of the quark condensate. Nuclear matter stability is ensured once the scalar response of the nucleon depending on the quark confinement mechanism is properly incorporated. The needed parameters are estimated from lattice results and a satisfactory description of bulk properties follows, the only really free parameter being the $ωNN$ coupling constant. Pion loops can be also incorporated to obtain in a consistent way the finite density chiral susceptibilities. A good description of the asymmetry energy is obtained once the full rho meson exchange and Fock terms are included.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑