大密度束缚手征对称强子与Casher论证
Confined but chirally symmetric hadrons at large density and the Casher's argument
摘要：
Casher的论点被认为是相当普遍的，它指出在限制状态下，手征对称性必然被破坏。在大N_c极限和中低温条件下，QCD被限制在任意大的密度范围内，应该出现夸克物质。在一个明显受限的手征对称模型中，即在t Hooft模型的3+1维推广中，已经证明了在零温度和超过临界密度时，当夸克仍然被限制在色单强子中时，手征对称性恢复。这与出纳员的论点相冲突。在这里，我们解释了为什么卡希尔的论点失败，并澄清这种限制，但手征对称强子背后的物理机制。
英文摘要：
Casher's argument, which is believed to be quite general, states that in the confining regime chiral symmetry is necessarily broken. In the large-N_c limit and at moderate and low temperatures QCD is confining up to arbitrary large densities, and there should appear a quarkyonic matter. It has been demonstrated, within a manifestly confining and chirally symmetric model, which is a 3+1 dimensional generalization of the 't Hooft model, that, at zero temperature and at a density exceeding a critical one, the chiral symmetry is restored while quarks remain confined in color-singlet hadrons. This is in conflict with the Casher's argument. Here we explain the reason why the Casher's argument fails and clarify the physical mechanism lying behind such confined but chirally symmetric hadrons.
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