论文标题
有效理论和QCD过渡方面
Aspects on Effective Theories and the QCD transition
论文作者
论文摘要
我们回顾了了解量子染色体动力学（QCD）过渡及其性质方面的最新进展，并特别注意基于有效理论的不同方法中手性对称性恢复的分析。在介绍了从理论，实验和晶格方面介绍当前对相图的知识的主要方面之后，我们讨论了一些最近的问题，在这些问题中，依赖有效理论的方法特别有用。特别是，诸如手性扰动理论，单位性和病房身份之类的思想的结合使我们能够成功地描述成功的几种感兴趣。这与预期的数量尤其重要，这些量是由标量和拓扑敏感性等强子气体的光膜组件支配的。此外，病房的身份和有效的拉格朗日人为手性和$ u（1）_a $伴侣变性属性提供了系统的结果，这对于这两个过渡之间的相互作用和手性对称性恢复的性质至关重要。特别注意这个理论框架与晶格模拟的联系。
We review recent advances in the understanding of the Quantum Chromodynamics (QCD) transition and its nature, paying special attention to the analysis of chiral symmetry restoration within different approaches based on effective theories. After presenting some of the main aspects of the current knowledge of the phase diagram from the theoretical, experimental and lattice sides, we discuss some recent problems where approaches relying on effective theories have been particularly useful. In particular, the combination of ideas such as Chiral Perturbation Theory, unitarity and Ward Identities allows us to describe successfully several observables of interest. This is particularly relevant for quantities expected to be dominated by the light meson components of the hadron gas such as the scalar and topological susceptibilities. In addition, ward identities and effective Lagrangians provide systematic results regarding chiral and $U(1)_A$ partner degeneration properties which are of great importance for the interplay between those two transitions and the nature of chiral symmetry restoration. Special attention is paid to the connection of this theoretical framework with lattice simulations.
