Ilgenfritz Ernst-Michael, Pawlowski Jan M, Rothkopf Alexander, Trunin Anton
1Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, 141980 Dubna, Russia.
2Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany.
Eur Phys J C Part Fields. 2018;78(2):127. doi: 10.1140/epjc/s10052-018-5593-7. Epub 2018 Feb 14.
We investigate gluon correlation functions and spectral functions at finite temperature in Landau gauge on lattice QCD ensembles with dynamical twisted-mass quarks flavors, generated by the tmfT collaboration. They cover a temperature range from using the fixed-scale approach. Our study of spectral properties is based on a novel Bayesian approach for the extraction of non-positive-definite spectral functions. For each binned spatial momentum we take into account the gluon correlation functions at all available discrete imaginary frequencies. Clear indications for the existence of a well defined quasi-particle peak are obtained. Due to a relatively small number of imaginary frequencies available, we focus on the momentum and temperature dependence of the position of this spectral feature. The corresponding dispersion relation reveals different in-medium masses for longitudinal and transversal gluons at high temperatures, qualitatively consistent with weak coupling expectations.
我们在由tmfT合作生成的具有动态扭曲质量夸克味的格点QCD系综上，采用固定尺度方法，研究了有限温度下朗道规范中的胶子关联函数和谱函数。它们覆盖了一个温度范围。我们对谱性质的研究基于一种用于提取非正定谱函数的新颖贝叶斯方法。对于每个分箱的空间动量，我们考虑了所有可用离散虚频率下的胶子关联函数。获得了存在明确准粒子峰的清晰迹象。由于可用虚频率数量相对较少，我们专注于该谱特征位置的动量和温度依赖性。相应的色散关系揭示了高温下纵向和横向胶子的不同介质中质量，定性上与弱耦合预期一致。
