低能量子色动力学中的抗磁和顺磁相
Diamagnetic and Paramagnetic Phases in Low-Energy Quantum Chromodynamics
摘要：
虽然人们知道，QCD真空中的磁背景下表现出的低能量域的抗磁和顺磁特性，在π介子为主的制度出现的相应的阶段仍然缺乏系统的调查。在这里，在两味手征微扰理论，考虑到π介子-π介子相互作用，我们分析了在磁化和磁化率的零和有限温度部分之间的微妙的相互作用。在顺磁性和反磁性相，磁化率与温度和磁场强度的关系是非单调的。我们的低能量分析补充格点量子色动力学，目前是在更高的温度和更强的磁场。
英文摘要：
While it is known that the QCD vacuum in a magnetic background exhibits both diamagnetic and paramagnetic characteristics in the low-energy domain, a systematic investigation of the corresponding phases emerging in the pion-dominated regime is still lacking. Here, within two-flavor chiral perturbation theory, taking into account the pion-pion interaction, we analyze the subtle interplay between zero- and finite-temperature portions in the magnetization and magnetic susceptibility. The dependence of the magnetic susceptibility on temperature and magnetic field strength in the paramagnetic and diamagnetic phase is non-monotonic. Our low-energy analysis complements lattice QCD that is currently operating at higher temperatures and stronger magnetic fields.
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