强非均匀磁场中奇异夸克物质的各向异性压力
Anisotropic pressure in strange quark matter in the presence of a strong nonuniform magnetic field
摘要：
在电荷中性和β平衡条件下，利用唯象的MIT袋模型研究了非均匀磁场中奇异夸克物质（SQM）的热力学性质.磁场强度的空间依赖性由重子化学势的指数形式和幂形式的依赖性来模拟。发现磁化SQM中的总能量密度、纵压和横压是重子化学势的函数。阐明了奇异夸克星的中心磁场强度是由一个临界值所约束的，在这个临界值上，在中心磁场变化的情况下，星内部某个地方的纵向压力对重子化学势的导数首先消失.在这个上界以上，磁化SQM中沿磁场的不稳定性发展。磁场强度对重子化学势的依赖关系在指数型和幂型之间的变化对临界磁场强度有不可忽略的影响，而在磁化SQM的绝对稳定窗口内袋压的变化对临界磁场的影响很小。
英文摘要：
Thermodynamic properties of strange quark matter (SQM) in a nonuniform magnetic field are studied within the phenomenological MIT bag model under the charge neutrality and beta equilibrium conditions, relevant to the interior of strange quark stars. The spatial dependence of the magnetic field strength is modeled by the dependence on the baryon chemical potential in the exponential and power forms. The total energy density, longitudinal and transverse pressures in magnetized SQM are found as functions of the baryon chemical potential. It is clarified that the central magnetic field strength in a strange quark star is bound from above by the critical value at which the derivative of the longitudinal pressure with respect to the baryon chemical potential vanishes first somewhere in the interior of a star under varying the central field. Above this upper bound, the instability along the magnetic field is developed in magnetized SQM. The change in the form of the dependence of the magnetic field strength on the baryon chemical potential between the exponential and power ones has a nonnegligible effect on the critical magnetic field strength while the variation of the bag pressure within the absolute stability window for magnetized SQM has a little effect on the critical field.
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