论文标题
使用梯度流量从晶格中扩散重的夸克动量
Heavy quark momentum diffusion from the lattice using gradient flow
论文作者
论文摘要
我们将梯度流程应用于颜色 - 电动的两点函数，该功能编码了重型夸克动量扩散系数。这些模拟是在Quenched近似值中的精细各向同性晶格上进行的，以$ 1.5 \，T_C $进行。连续外推在固定流动时间进行，然后再推断为零流动时间。在威尔逊流下，这种相关函数的扰动计算用于增强非扰动晶格相关器的外推。零流动时间的连续相关器的最终估计值在很大程度上与使用多级算法从先前的研究中获得的估计值一致。我们基于扰动模型进行光谱重建，以估计重夸克动量扩散系数。我们这里提出的方法可为相关器产生高精度数据，也适用于动态费用的动作。
We apply the gradient flow on a color-electric two-point function that encodes the heavy quark momentum diffusion coefficient. The simulations are done on fine isotropic lattices in the quenched approximation at $1.5\,T_c$. The continuum extrapolation is performed at fixed flow time followed by a second extrapolation to zero flow time. Perturbative calculations of this correlation function under Wilson flow are used to enhance the extrapolations of the non-perturbative lattice correlator. The final estimate for the continuum correlator at zero flow time largely agrees with one obtained from a previous study using the multi-level algorithm. We perform a spectral reconstruction based on perturbative model fits to estimate the heavy quark momentum diffusion coefficient. The approach we present here yields high-precision data for the correlator and is also applicable for actions with dynamical fermions.
