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arXiv 1012.1226hep-phhep-lathep-thnucl-th
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封闭但手征对称的稠密冷物质

Confining but chirally symmetric dense and cold matter

L. Ya. Glozman

备注：
9 pp., invited talk presented at 6th Int. Workshop on Critical Point and Onset of Deconfinement, 23-29 August, 2010, Dubna, Russia and at Int. Joint ECT*-EMMI Workshop "Chiral Symmetry and Confinement in Cold, Dense Quark Matter", Trento, Italy, 19-23 July, 2010
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摘要：

评述了冷的、致密的、带禁闭的手征对称物质存在的可能性。这个问题的答案取决于量子色动力学的质量产生机制以及禁闭和手征对称性破缺的相互联系。这个问题可以从强子的谱学和它们的轴向性质得到澄清。高激发态强子几乎系统的宇称加倍表明它们的质量与真空中的手征对称性破缺无关，而是近似手征对称的。那么就有可能存在限制性但手征对称的物质。我们澄清了一个可能的机制，在低温和大密度下这样的相。也就是说，在大密度的泡利阻塞防止间隙方程产生一个解决方案与破缺的手征对称性。然而，夸克格林函数的手征对称部分以及所有颜色的非单重态量仍然是红外发散的，这意味着该系统是禁闭的。这种物质的一个可能的相变很可能是一级相变。这是因为最底层的强子没有手征伙伴。

英文摘要：

The possibility for existence of cold, dense chirally symmetric matter with confinement is reviewed. The answer to this question crucially depends on the mechanism of mass generation in QCD and interconnection of confinement and chiral symmetry breaking. This question can be clarified from spectroscopy of hadrons and their axial properties. Almost systematical parity doubling of highly excited hadrons suggests that their mass is not related to chiral symmetry breaking in the vacuum and is approximately chirally symmetric. Then there is a possibility for existence of confining but chirally symmetric matter. We clarify a possible mechanism underlying such a phase at low temperatures and large density. Namely, at large density the Pauli blocking prevents the gap equation to generate a solution with broken chiral symmetry. However, the chirally symmetric part of the quark Green function as well as all color non-singlet quantities are still infrared divergent, meaning that the system is with confinement. A possible phase transition to such a matter is most probably of the first order. This is because there are no chiral partners to the lowest lying hadrons.

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