Magnetic field effect on the pion superfluid

Magnetic field effect on the pion superfluid
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磁场对π介子超流体的影响

DOI:
10.1103/physrevd.102.114006
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发表时间:
2020-09
期刊:
影响因子:
5
通讯作者:
Shijun Mao
Shijun Mao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shijun Mao

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在Pauli-Villars正则化NJL模型框架下研究了磁场对π介子超流相变的影响。我们不直接处理带电的π凝聚,而是应用Goldstone定理(无质量Goldstone玻色子$\pi^+$)来确定π超流相的起始,得到了磁场、温度、同位旋和重子化学势空间中的相图.在弱磁场下,解析地证明了π超流相变的临界同位旋化学势等于磁场中$\pi^+$介子的质量。π超流相被推迟到更高的同位旋化学势,在外加磁场作用下,π超流相可以在更高的温度和更高的重子化学势下存活。
Magnetic field effect on pion superfluid phase transition is investigated in frame of a Pauli-Villars regularized NJL model. Instead of directly dealing with charged pion condensate, we apply the Goldstone's theorem (massless Goldstone boson $\pi^+$) to determine the onset of pion superfluid phase, and obtain the phase diagram in magnetic field, temperature, isospin and baryon chemical potential space. At weak magnetic field, it is analytically proved that the critical isospin chemical potential of pion superfluid phase transition is equal to the mass of $\pi^+$ meson in magnetic field. The pion superfluid phase is retarded to higher isospin chemical potential, and can survive at higher temperature and higher baryon chemical potential under external magnetic field.
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