Dynamical quasiparticle properties are determined from lattice
QCD along the line of the Peshier model for the running strong coupling constant in case of three light flavors. By separating time-like and space-like quantities in the number density and energy density the effective degrees of freedom in the gluon and quark sector may be specified from the time-like densities. The space-like parts of the energy densities are identified with interaction energy (or potential energy) densities. By using the time-like parton densities (or scalar densities) as independent degrees of freedom variations of the potential energy densities with respect to the time-like gluon and/or fermion densities lead to effective mean-fields for time-like gluons and quarks as well as to effective gluon-gluon, quark-gluon and quark-quark (quark-antiquark) interactions. The latter dynamical quantities are found to be approximately independent on the quark chemical potential and thus well suited for an inplementation in off-shell parton transport approaches. Results from the dynamical quasiparticle model (DQPM) in case of two dynamical light quark flavors are compared to lattice QCD calculations for the net quark density as well as for the 'back-to-back' differential dilepton production rate by $q-{\bar q}$ annihilation. The DQPM is found to pass the independent tests.
Dilepton production by dynamical quasiparticles in the strongly interacting quark gluon plasma
讨论了强相互作用夸克胶子等离子体（sQGP）组分产生双轻子的问题。为了在较低的等离子体温度（O（T_c））、较低的双轻子质量（O（1GeV））和较强的耦合（α S =0.5-1）下进行定量预测，我们不仅考虑了高阶pQCD反应机制，而且考虑了夸克、反夸克和胶子的非微扰谱函数（离壳）和自能，从而超出了主导扭转。为此，我们的计算利用了匹配的动力学准粒子模型（DQPM）提供的夸克和胶子非微扰传播子的参数化来重现晶格数据。DQPM用单粒子格林函数描述QCD性质（在两粒子不可约方法的意义上），并导致sQGP的成分是有效准粒子的概念，这些准粒子是大质量的，具有宽谱函数（由于大的相互作用速率）。本文导出了反应q+qbar->l^+l^-中双轻子产生的离壳层截面。（Drell-Yan机理），q+qbar->g+l^+l^-（夸克湮灭与末态的胶子韧致辐射），q（qbar）+g->q（qbar）+l^+l^-通过用夸克和胶子的DQPM传播子修饰微扰图中的夸克和胶子线，得到了sQGP中g->q+qbar+l ^+l^-和q（qbar）->q（qbar）+g+l^+l^-（虚胶子衰变，虚夸克衰变）的关系.
Dynamical renormalization group resummation of finite temperature infrared divergences
我们引入动力学重整化群方法，直接实时研究弛豫和阻尼，并将其应用于标量QED中红外发散的研究。这种方法允许一个一致的重申与准静态横向光子的交换红外效应，并导致异常的对数松弛的形式$e^{-αT t \ln[t/t_0]}$，防止在有限温度下的带电集体激发的准粒子解释。硬热环重建方案始终纳入动力学重整化群产生的等离子体中的弛豫和阻尼现象的实时图像，超越了准粒子图像和其他类型的重建方案的概念限制。我们推导出一个简单的标准，建立准粒子图片的有效性，以最低的顺序。
Transport properties and equation-of-state of hot and dense QGP matter near the critical end-point in the phenomenological dynamical quasi-particle model
