Hadron masses and baryonic scales in G 2 -QCD at finite density
Hadron masses and baryonic scales in G 2 -QCD at finite density
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有限密度下 G 2 -QCD 中的强子质量和重子尺度
DOI：
10.1103/physrevd.89.056007
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发表时间：
2014
影响因子：
5
通讯作者：
L. von Smekal
中科院分区：
文献类型：
--
作者：
B. Wellegehausen;A. Maas;A. Wipf;L. von Smekal
量子色动力学在中子星密度下的相图仍然难以捉摸，主要是由于费米子符号问题。与此同时，在模型中预测了大量可能的阶段。而用例外李群代替QCD的规范群的-QCD则不存在符号问题，可以在这样的密度下用标准格点方法进行模拟。因此，它提供了基准模型和功能连续统方法，它有助于解开在高密度强相互作用的物质的可能阶段的性质。在理解这些阶段的工具是，量子色动力学有费米子重子，因此它可以维持重子费米面。由于-QCD的重子谱也包含玻色子双夸克和其他可能更奇特的态，所以在解开重子密度的相应贡献之前，理解这个谱是很重要的。在这里，我们提出了第一个系统的分类，这个频谱。尽管我们的晶格仍然相当粗糙，但该谱的定性特征反映在我们在不同夸克质量下的模拟结果中。这使我们能够将质量等级，从标量的可能是戈德斯通玻色子和中间矢量玻色子到核子和三角洲，以及在有限化学势下在总重子密度中观察到的单个结构联系起来。
The QCD phase diagram at densities relevant to neutron stars remains elusive, mainly due to the fermion-sign problem. At the same time, a plethora of possible phases has been predicted in models. Meanwhile-QCD, for which thegauge group of QCD is replaced by the exceptional Lie group, does not have a sign problem and can be simulated at such densities using standard lattice techniques. It thus provides benchmarks to models and functional continuum methods, and it serves to unravel the nature of possible phases of strongly interacting matter at high densities. Instrumental in understanding these phases is that-QCD has fermionic baryons, and that it can therefore sustain a baryonic Fermi surface. Because the baryon spectrum of-QCD also contains bosonic diquark and probably other more exotic states, it is important to understand this spectrum before one can disentangle the corresponding contributions to the baryon density. Here we present a first systematic classification of this spectrum. The qualitative features of this spectrum are reflected in our simulation results at different quark masses although our lattices are still rather coarse. This allows us to relate the mass hierarchy, ranging from scalar would-be-Goldstone bosons and intermediate vector bosons to thenucleons and deltas, to individual structures observed in the total baryon density at finite chemical potential.