论文标题
Lattice QCD的夸克 - 杜伦等离子体中的光子产生速率
The rate of photon production in the quark-gluon plasma from lattice QCD
论文作者
论文摘要
我们使用Lattice QCD计算夸克 - 杜伦等离子体中现实光子产生的热速率。该计算基于极化张量的空间横向部分和纵向部分之间的差异，该张量的优点是在大频率下迅速掉落。我们从晶状体QCD的时间摩托车表示中获得了这种线性组合，并在连续限制中具有两种夸克风味，精度约为每毫米两部分。为相关的光谱函数应用理论动机的拟合Ansatz，我们获得了与QCD弱偶联计算一致的光子速率的值；对于Photon Momenta $ 1.0 \ leq K [{\ rm GEV}] \ LEQ 1.4 $，我们的非扰动结果将速率限制为不超过弱耦合预测的两倍。我们还提供了对所有频率和动量有效的电磁光谱函数的物理解释。
We calculate the thermal rate of real-photon production in the quark-gluon plasma at a temperature of $T=254$ MeV using lattice QCD. The calculation is based on the difference between the spatially transverse and longitudinal parts of the polarization tensor, which has the advantage of falling off rapidly at large frequencies. We obtain this linear combination in the time-momentum representation from lattice QCD with two flavors of quarks in the continuum limit with a precision of about two parts per mille. Applying a theoretically motivated fit ansatz for the associated spectral function, we obtain values for the photon rate that are in line with QCD weak-coupling calculations; for photon momenta $ 1.0\leq k[{\rm GeV}]\leq 1.4$, our non-perturbative results constrain the rate to be no larger than twice the weak-coupling prediction. We also provide a physics interpretation of the electromagnetic spectral functions valid for all frequencies and momenta.
