AI 中文总结
研究高于T_{ch}的QCD弦状流体中类π激发，发现其肿胀是流代数要求的模型无关效应，该特性可解释实验中T_{ch}以上组分的高集体性与小平均自由程
AI 中文摘要
多个格点证据支持量子色动力学（QCD）在手征对称性恢复温度T_{ch}~155 MeV以上存在禁闭但手征对称的弦状流体区域。该区域具有近似手征自旋对称性及其扩展，意味着传播的激发态是由色电弦连接成色单态的手征对称夸克。格点上从空间和时间关联函数中提取出T_{ch}以上清晰的π、π'峰，这些峰随温度升高而展宽，大致在3T_{ch}处消失。在明显禁闭且手征对称的模型中研究了T_{ch}以上的类介子激发，研究表明，禁闭区域内的手征对称性恢复是因为热夸克激发对夸克凝聚存在所需能级的泡利阻塞。同样的泡利阻塞导致T_{ch}以上低自旋介子大幅肿胀，在手征极限下变得无限大，这一特性对解释实验中观测到的T_{ch}以上组分的高集体性和极小平均自由程至关重要。本文证明，T_{ch}以上π介子的肿胀是流代数所要求的模型无关效应。
英文摘要
Multiple lattice evidences support the existence of a confining but chirally symmetric stringy fluid regime of QCD above the chiral symmetry restoration temperature at T_{ch} ~ 155 MeV. This regime is characterized by an approximate chiral spin symmetry and its extensions which means that the propagating excitations represent the chirally symmetric quarks connected into color singlets by the chromoelectric string. Clear π,π' peaks above T_{ch} were extracted on the lattice from the spatial and temporal correlators, which become broader with temperature and disappear roughly at $3T_{ch}$. The meson-like excitations above T_{ch} were studied within the manifestly confining and chirally symmetric model. It has been demonstrated that the chiral symmetry restoration in the confining regime happens because of Pauli blocking of the levels, required for the existence of the quark condensate, by the thermal quark excitation. The same Pauli blocking leads to a huge swelling of the low-spin mesons above T_{ch} which become infinitely large in the chiral limit. This property should be crucial for the explanation of the high collectivity and a very small mean-free path of the constituents above $T_{ch}$ seen experimentally. Here we demonstrate that the swelling of pions above T_{ch} is a model-independent effect required by current algebra.
Comments9 pages, some clarifications and reference have been added
