Equation of State of a Magnetized Dense Neutron System
Equation of State of a Magnetized Dense Neutron System
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DOI：
10.3390/universe5050104
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发表时间：
2019-05
期刊：
影响因子：
2.9
通讯作者：
E. J. Ferrer;A. Hackebill
中科院分区：
文献类型：
--
作者：
E. J. Ferrer;A. Hackebill
讨论了磁场对多粒子中子系统状态方程的影响。我们发现，由于压力的各向异性，横向于磁场方向的压力随着磁场的增加，而一个沿着场方向减少。我们还表明，在这种介质中存在一个显着的负场相关的贡献与真空压力。这种负压需要足够高的中子密度（对应于μ = 2.25 GeV的重子化学势）来产生必要的正物质压力，以补偿引力。的减少的平行的压力与字段限制的最大磁场的值的顺序为10 - 18 G，其中的压力衰减到零。我们表明，所有这些影响的组合产生的系统状态方程的一个微不足道的变化。我们还发现，该中子系统表现出顺磁行为表示的居里定律在高温制度。报告的结果可能是感兴趣的天体物理学的紧凑的对象，如磁星，这是赋予了大量的磁场。
We discuss how a magnetic field can affect the equation of state of a many-particle neutron system. We show that, due to the anisotropy in the pressures, the pressure transverse to the magnetic field direction increases with the magnetic field, while the one along the field direction decreases. We also show that in this medium there exists a significant negative field-dependent contribution associated with the vacuum pressure. This negative pressure demands a neutron density sufficiently high (corresponding to a baryonic chemical potential of μ = 2.25 GeV) to produce the necessary positive matter pressure that can compensate for the gravitational pull. The decrease of the parallel pressure with the field limits the maximum magnetic field to a value of the order of 10 18 G, where the pressure decays to zero. We show that the combination of all these effects produces an insignificant variation of the system equation of state. We also found that this neutron system exhibits paramagnetic behavior expressed by the Curie’s law in the high-temperature regime. The reported results may be of interest for the astrophysics of compact objects such as magnetars, which are endowed with substantial magnetic fields.