AI 中文总结
在 chiral quark-soliton 模型框架下，从 QCD 瞬子真空导出的能量动量张量算符出发，经扭度投影分离出扭度 -4 算符的\(\overline{c}\)形状因子，给出质子味分解的质量、自旋等分布及形状因子，探讨其力学稳定性。
AI 中文摘要
在本次报告中，我们回顾了一系列关于质子引力形状因子的味分解及其在 chiral quark-soliton 模型框架内的力学性质的近期工作。从 QCD 瞬子真空导出的能量 - 动量张量算符开始，我们对能量 - 动量张量算符进行扭度投影，将其投影到扭度 -2 和扭度 -4 分量中，这使我们能够分离出来自扭度 -4 算符的\(\overline{c}\)形状因子。我们给出了质子的味分解质量、自旋、压力和剪切力分布，以及相应的形状因子。虽然上夸克在质子的质量和自旋中都占主导地位，但发现奇异夸克对\(D\)项形状因子有相当大的贡献。我们还讨论了由压力和剪切力分布控制的质子的力学稳定性。
英文摘要
We review in the present talk a series of recent works on the flavor decomposition of the gravitational form factors of the proton and its mechanical properties within the framework of the chiral quark-soliton model. Starting from the energy-momentum tensor operator derived from the QCD instanton vacuum, we carry out the twist projection of the energy-momentum tensor operator into its twist-2 and twist-4 components, which enables us to isolate the $\overline{c}$ form factor originating from the twist-4 operator. We present the flavor-decomposed mass, spin, pressure, and shear-force distributions of the proton, together with the corresponding form factors. While the up quark dominates both the mass and the spin of the proton, the strange quark is found to contribute sizably to the $D$-term form factor. We also discuss the mechanical stability of the proton governed by the pressure and shear-force distributions.
Comments12 pages. 4 figures. Typos were removed. One paragraph was improved. Contribution to the 9th Asia-Pacific conference on Few-body problems in Physics(APFB 2025) Proceedings, held from September 8 to September 12, 2025, at Van Lang University, Vietnam
