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arXiv 1809.07028hep-ph
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外磁场对热重介质中核子质量的影响:Walecka模型中的逆磁催化

Effect of external magnetic field on nucleon mass in hot and dense medium : Inverse Magnetic Catalysis in Walecka Model

Arghya Mukherjee, Snigdha Ghosh, Mahatsab Mandal, Sourav Sarkar, Pradip Roy

摘要:

在平均场近似下,在Walecka模型中研究了恒定外背景磁场下真空到核物质的相变。利用费米子传播子的修正“弱”场展开,对带电粒子和中性粒子都加入了非平凡修正项,从而考虑了反常核子磁矩。核子磁矩的作用有利于零温度和零重子密度下的磁催化效应。然而,将研究扩展到有限的温度下,观察到异常核磁矩在表征真空到核物质相变的定性行为中起着至关重要的作用,即使在弱外部磁场的情况下。观察到真空到核介质相变的临界温度随外加磁场的增加而降低,这在Walecka模型中被认为是逆磁催化作用,而在磁矩消失的情况下则相反,表明磁催化作用。

英文摘要:

Vacuum to nuclear matter phase transition has been studied in presence of constant external background magnetic field with the mean field approximation in Walecka model. The anomalous nucleon magnetic moment has been taken into account using the modified "weak" field expansion of the fermion propagator having non-trivial correction terms for charged as well as for neutral particles. The effect of nucleon magnetic moment is found to favour the magnetic catalysis effect at zero temperature and zero baryon density. However, extending the study to finite temperatures, it is observed that the anomalous nuclear magnetic moment plays a crucial role in characterizing the qualitative behaviour of vacuum to nuclear matter phase transition even in case of the weak external magnetic fields . The critical temperature corresponding to the vacuum to nuclear medium phase transition is observed to decrease with the external magnetic field which can be identified as the inverse magnetic catalysis in Walecka model whereas the opposite behaviour is obtained in case of vanishing magnetic moment indicating magnetic catalysis.

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