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arXiv 2005.10538hep-phhep-lathep-thnucl-th
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T_c以上SU(3)_color的SU(2)_color子群中守恒电荷、手征自旋对称性和去禁闭的涨落

Fluctuations of conserved charges, chiral spin symmetry and deconfinement in an SU(2)_color subgroup of SU(3)_color above T_c

L. Ya. Glozman

摘要:

在手征对称性恢复的赝临界温度T_c以上,能量和压力都远离夸克-胶子-等离子体极限(即自由夸克和胶子的理想气体)。同时,在T_c以上不久,守恒电荷的涨落表现得好像夸克是自由粒子。在T_c -3 T_c区间内,QCD中出现了与自由夸克不一致的手征自旋对称性,表明自由度是手征对称夸克被色电场束缚到色单态物体中。在这里,我们分析在这个时间间隔的时间和空间的双折射,并证明它们同时表明手征自旋对称性以及缺乏夸克间的相互作用的通道约束的电流守恒。后者的渠道负责保守电荷和双轻子的波动。假设SU(3)_color的一个SU(2)_color子群在T_c以上很快被解除限制,但在T_c -3 T_c区间内的SU(3)_color/SU(2)_color中的禁闭被解除限制,我们就能调和上述所有的经验事实。

英文摘要:

Above a pseudocritical temperature of chiral symmetry restoration T_c the energy and the pressure are very far from the quark-gluon-plasma limit (i.e. ideal gas of free quarks and gluons). At the same time very soon above T_c fluctuations of conserved charges behave as if quarks were free particles. Within the T_c - 3T_c interval a chiral spin symmetry emerges in QCD which is not consistent with free quarks and suggests that degrees of freedom are chirally symmetric quarks bound into the color-singlet objects by the chromoelectric field. Here we analyse temporal and spatial correlators in this interval and demonstrate that they indicate simultaneously the chiral spin symmetry as well as absence of the interquark interactions in channels constrained by a current conservation. The latter channels are responsible for both fluctuations of conserved charges and for dileptons. Assuming that a SU(2)_color subgroup of SU(3)_color is deconfined soon above T_c but confinement persits in SU(3)_color/SU(2)_color in the interval T_c - 3T_c we are able to reconcile all empirical facts listed above.

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