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arXiv 0710.5491hep-ph
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正则化对手性和轴对称性恢复的影响

Effects of the Regularization on the Restoration of Chiral and Axial Symmetries

Pedro Costa, M. C. Ruivo, C. A. de Sousa

摘要:

本文在SU(3)Nambu-Jona-Lasinio模型下研究了有限温度正则化对手征对称性和轴对称性的影响。正则化包括在有限温度下收敛的积分中使用无限截止,这一过程允许人们考虑高温下高动量夸克的影响。结果表明,与常规正则化方法相比,相变的临界温度更接近于晶格结果,并且手征对称性和轴对称性的恢复(由几个观测量的行为表征)在较高的温度下同时发生.轴对称性的恢复似乎是被动态破坏的手征对称性完全恢复的自然结果。通过一个模拟瞬子抑制效应的附加正则化,利用反常系数的温度依赖性,我们发现U(2)对称性的恢复向较低的值移动,但在高温下的主导效应来自于新的正则化,它增强了夸克凝聚的减少,特别是在奇异扇区。

英文摘要:

The effects of a type of regularization for finite temperatures on the estoration of chiral and axial symmetries are investigated within the SU(3) Nambu-Jona-Lasinio model. The regularization consists in using an infinite cutoff in the integrals that are convergent at finite temperature, a procedure that allows one to take into account the effects of high momentum quarks at high temperatures. It is found that the critical temperature for the phase transition is closer to lattice results than the one obtained with the conventional regularization, and the restoration of chiral and axial symmetries, signaled by the behavior of several observables, occurs simultaneously and at a higher temperature. The restoration of the axial symmetry appears as a natural consequence of the full recovering of the chiral symmetry that was dynamically broken. By using an additional ansatz that simulates instanton suppression effects, by means of a convenient temperature dependence of the anomaly coefficient, we found that the restoration of U(2) symmetry is shifted to lower values, but the dominant effect at high temperatures comes from the new regularization that enhances the decrease of quark condensates, especially in the strange sector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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