标题： QCD瞬时真空中的π介子引力形式因子 II 显示英文标题

标题： Pion gravitational form factors in the QCD instanton vacuum II

摘要： 我们重新审视了硬QCD对π介子引力形式因子(GFFs)的贡献，这些贡献用到了扭曲-2、3 π介子分布振幅(DA)，并且包括了来自瞬子的新半硬贡献。π介子DA在QCD瞬子真空下被评估，并且随后被适当地演化到更高的分辨率。结果与我们最近基于QCD瞬子真空的结果，以及Bethe-Salpeter计算和近期格点数据进行了比较。插值的硬和软对π介子D形态因子的贡献被用来推导π介子内的(引力)压力和剪切力，并明确界定了它们的范围。 显示英文摘要

摘要： We revisit the hard QCD contributions to the pion gravitational form factors (GFFs), in terms of the twist-2,3 pion distribution amplitudes (DA), including novel semi-hard contributions from the instantons. The pion DAs are evaluated in the QCD instanton vacuum, and then properly evolved to higher resolution. The results are compared to our recent results from the QCD instanton vacuum, as well as Bethe-Salpeter calculations and recent lattice data. The interpolated hard and soft contributions to the pion D-form-factor, are used to derive the (gravitational) pressure and shear within the pion, with a clear delineation of their range.