有限温度和密度下的费米激发
Fermionic excitations at finite temperature and density
摘要：
研究了由夸克和（赝）标量介子组成的热密强相互作用介质中的费米子激发。特别是，我们使用的双味夸克介子模型结合功能重整化群的方法，它允许考虑从热和量子涨落的影响。由此产生的费米激发光谱的研究通过计算夸克光谱函数在有限的温度，夸克化学势，和空间动量。这涉及到从虚能量到实能量的解析延拓，通过将先前引入的解析延拓FRG（aFRG）方法扩展到当前情况。我们确定了三种不同的集体激发在介质中：普通热夸克，等离子体模式，和超软“声子”模式。这些模式的色散关系提取的夸克谱函数。当比较相应的结果从一个FRG改进的单回路计算显着的协议。
英文摘要：
We study fermionic excitations in a hot and dense strongly interacting medium consisting of quarks and (pseudo-)scalar mesons. In particular, we use the two-flavor quark-meson model in combination with the Functional Renormalization Group approach, which allows to take into account the effects from thermal and quantum fluctuations. The resulting fermionic excitation spectrum is investigated by calculating the quark spectral function at finite temperature, quark chemical potential, and spatial momentum. This involves an analytic continuation from imaginary to real energies by extending the previously introduced analytically-continued FRG (aFRG) method to the present case. We identify three different collective excitations in the medium: the ordinary thermal quark, the plasmino mode, and an ultra-soft "phonino" mode. The dispersion relations of these modes are extracted from the quark spectral function. When compared to corresponding results from an FRG-improved one-loop calculation remarkable agreement is found.
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