标题： 手征自旋对称性和高温QCD 显示英文标题

标题： Chiral spin symmetry and hot QCD

摘要： 在这次报告中，我们概述了表明在量子色动力学（QCD）中存在三种在加热时通过平滑交叉连接的不同定性区域的主要结果：一个强子气体、一根弦的流体和一个夸克-胶子等离子体。 在联合的大 \$N_c\$ 极限和手征极限中，这些区域可能成为由相变分开的明确相：一个手征恢复相变约在 \$T_\{\text\{{超}\}\} \sim 130\$ MeV 左右，以及一个脱禁闭相变约在 \$T_d \sim 300\$ MeV 左右。 验证这一问题在格点上的正确性应该是一项重要的任务。 我们将介绍一种手征自旋对称性，这是电动力学电部分和具有轻夸克的 QCD 的一种对称性。 它在手征恢复交叉上方的大 QCD 中近似实现，并在夸克-胶子等离子体相中消失。 纯胶体作用的中心对称性和轻夸克 QCD 拉格朗日电部分的手征自旋对称性互补以区分限制相及其消失。 我们还讨论了其他关于弦状流体的格点证据：从格点关联函数提取的强子共振；在 \$T < \sim 600\$ MeV 下热微扰理论的崩溃以及指向 \$T \sim 155\$ MeV 以上 \$N_c\$ 标度的守恒电荷涨落。 显示英文摘要

摘要： In this talk we overview main results indicating existence in QCD of three qualitatively different regimes connected by smooth crossovers upon heating: a hadron gas, a stringy fluid and a quark-gluon plasma. In the combined large N_c and chiral limit these regimes likely become distinct phases separated by phase transitions: a chiral restoration phase transition around T_{ch} ~ 130 MeV and a deconfinement phase transition around T_d ~ 300 MeV. It should be an important task to verify this issue on the lattice. We will introduce a chiral spin symmetry, which is a symmetry of the electric part of electrodynamics and of QCD with light quarks. It is realized approximately in QCD above the chiral restoration crossover and disappears in the QGP regime. The center symmetry of the pure glue action and the chiral spin symmetry of the electric part of the QCD Lagrangian with light quarks are complementary to distinguish the confining regime and its disappearance. We also address other lattice evidences for stringy fluid: hadron resonances extracted from the lattice correlators; breakdown of the thermal perturbation theory at T < ~ 600 MeV and fluctuations of conserved charges that point out the N_c scaling above T ~ 155 MeV.