标题： 手征相变：有效场论和全息性 显示英文标题

标题： Chiral phase transition: effective field theory and holography

摘要： 我们考虑与有限温度下QCD物质相关的手征相变，但重子密度为零。 可能，在手征极限下，两味QCD的手征相变是二阶的。 在相变温度附近，我们应用Schwinger-Keldysh形式化方法，并构建一个低能有效场论来描述该系统，在其中系统地捕捉涨落和耗散。 动力学变量包括手征电荷密度和序参量（手征凝聚）。 通过全息Schwinger-Keldysh技术，在修改后的AdS/QCD模型中进一步验证了有效作用量。 在适当忽略高阶项的情况下，从有效场论导出的随机方程类似于Hohenberg-Halperin分类中的模型F。 在有效场论框架下，我们简要讨论了手征对称性的自发破缺和戈德斯通模。 显示英文摘要

摘要： We consider the chiral phase transition relevant for QCD matter at finite temperature but with vanishing baryon density. Presumably, the chiral phase transition is of second order for two-flavor QCD in the chiral limit. Near the transition temperature, we apply the Schwinger-Keldysh formalism and construct a low-energy effective field theory for the system, in which fluctuations and dissipations are systematically captured. The dynamical variables involve the chiral charge densities and order parameter (chiral condensate). Via the holographic Schwinger-Keldysh technique, the effective action is further confirmed within a modified AdS/QCD model. With higher-order terms suitably neglected, the stochastic equations derived from the effective field theory resemble those of model F in the Hohenberg-Halperin classification. Within the effective field theory, we briefly discuss the spontaneous breaking of chiral symmetry and Goldstone modes.