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arXiv 1402.0737hep-ph
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磁背景中有限温度和密度夸克物质的临界终点和逆磁催化

Critical Endpoint and Inverse Magnetic Catalysis for Finite Temperature and Density Quark Matter in a Magnetic Background

M. Ruggieri, L. Oliva, P. Castorina, R. Gatto, V. Greco

摘要:

本文利用Ginzburg-Landau有效作用量理论,研究了夸克物质在磁场背景$\bm B$、有限温度和夸克化学势$μ$下的手征对称性破缺.作为计算有效作用量的微观模型,我们使用重整化夸克介子模型。我们的主要目标是研究临界终点${\cal CP}$随磁场强度的变化规律,并探讨在有限化学势下实现逆磁催化的可能性。我们发现,在零化学势的相变总是二阶的,对于小的和中间值的$\bm B$,${\cal CP}$向小$μ$移动,而对于较大的$\bm B$,它向适度较大的值的$μ$。我们的结果是在有限的化学势和不太大的磁场值的逆磁催化的情况下,而在较大的$\bm B$直接磁催化套在协议。

英文摘要:

In this article we study chiral symmetry breaking for quark matter in a magnetic background, $\bm B$, at finite temperature and quark chemical potential, $μ$, making use of the Ginzburg-Landau effective action formalism. As a microscopic model to compute the effective action we use the renormalized quark-meson model. Our main goal is to study the evolution of the critical endpoint, ${\cal CP}$, as a function of the magnetic field strength, and investigate on the realization of inverse magnetic catalysis at finite chemical potential. We find that the phase transition at zero chemical potential is always of the second order; for small and intermediate values of $\bm B$, ${\cal CP}$ moves towards small $μ$, while for larger $\bm B$ it moves towards moderately larger values of $μ$. Our results are in agreement with the inverse magnetic catalysis scenario at finite chemical potential and not too large values of the magnetic field, while at larger $\bm B$ direct magnetic catalysis sets in.

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