混合星磁场效应的自洽研究
A self-consistent study of magnetic field effects on hybrid stars
摘要：
本文利用广义相对论方法，通过求解耦合麦克斯韦-爱因斯坦方程，研究了强磁场对混合星的影响。假设磁场为轴对称极向磁场。我们考虑了磁场引起的能量动量张量的各向异性、磁场对物态方程的影响、物质与磁场的相互作用（磁化）以及强子的反常磁矩。所用的状态方程是西格玛模型的扩展强子和夸克SU（3）非线性实现，该模型描述了包含核子、超子和夸克的磁化混合星。根据我们的研究结果，磁化强度和磁场对EoS的影响对这些恒星的整体性质并不起重要作用。另一方面，磁场会导致这些天体的中心密度降低，导致自由度发生重大变化，并可能将混合星转化为强子星。
英文摘要：
In this work we study the effects of strong magnetic fields on hybrid stars by using a full general-relativity approach, solving the coupled Maxwell-Einstein equation in a self-consistent way. The magnetic field is assumed to be axi-symmetric and poloidal. We take into consideration the anisotropy of the energy-momentum tensor due to the magnetic field, magnetic field effects on equation of state, the interaction between matter and the magnetic field (magnetization), and the anomalous magnetic moment of the hadrons. The equation of state used is an extended hadronic and quark SU(3) non-linear realization of the sigma model that describes magnetized hybrid stars containing nucleons, hyperons and quarks. According to our results, the effects of the magnetization and the magnetic field on the EoS do not play an important role on global properties of these stars. On the other hand, the magnetic field causes the central density in these objects to be reduced, inducing major changes in the populated degrees of freedom and, potentially, converting a hybrid star into a hadronic star.
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