论文标题
在有限温度和密度下的费米子激发
Fermionic excitations at finite temperature and density
论文作者
论文摘要
我们研究了由夸克和（伪 - ）标量介子组成的热且密集的强烈相互作用介质中的费米子激发。特别是，我们将两种风味的夸克 - 梅森模型与功能重新分配组方法结合使用，这允许考虑热和量子波动的效果。通过在有限温度，夸克化学势和空间动量下计算夸克光谱函数来研究所得的费米子激发光谱。这涉及通过将先前引入的分析性FRG（AFRG）方法扩展到本案的分析延续。我们在介质中识别三种不同的集体激发：普通的热夸克，plasmino模式和超柔软的“ Phonino”模式。这些模式的分散关系是从夸克光谱函数中提取的。与FRG改良一环的相应结果相比，发现了显着的一致性。
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.
