Equilibrium of Rotating Strongly Magnetized Star and Abrupt Energy Release

磁场和恒星自转对相对论性恒星爆发非常重要。本研究项目的目的是阐明强磁化恒星周围的电磁场结构，阐明能量从恒星内部向外磁层的传播和传输，等离子体可能通过磁场重联或其他机制加速，最终转化为辐射。研究了阿尔芬波在强磁化恒星中的传播和透射。发现位移电流和恒星旋转是复杂耦合的，因此在磁主导状态下是非常重要的。开发了一种新的求解电磁场和等离子体运动的数值程序。假设轴对称和双组分流体。这个代码不同于MHD近似，甚至可以用于电支配的情况。得到了初步的结果，并将数值代码应用于脉冲星磁层的构造和伽马射线中继器的模型。在中子星的相关课题上发表了一些新的结果。它们是磁场衰减、中子星内部状态方程的一些观测约束、外部引力波引起的共振脉动、潮汐重力下的陀螺运动、旋转恒星杆不稳定性的非线性增长。

The magnetic fields and stellar rotation are very important for the burst on relativistic stars. The purpose of this research project is to clarify the electromagnetic field structure around the strongly magnetized stars and to clarify the propagation and transmission of energy from the interior of the star to external magnetosphere, where plasma may be accelerated by the reconnection of magnetic field or some other mechanism and the energy is eventually transformed to radiation. Propagation and the transmission of Alfven waves in strongly magnetized stars are examined. It is found that the displacement currents and stellar rotation are complicatedly coupled, and hence are very important in magnetically dominated regime.A new numerical code to solve electromagnetic fields and plasma motion has developed. Axially symmetry and two component fluids are assumed. This code is different from MHD approximation, and can be used even for electrically dominated case. The preliminary results are obtained and the numerical code is now applied to realistic case: construction of pulsar magnetosphere and a model of gamma ray repeaters.Some new results are published for related topics for neutron stars. They are magnetic field decay, constraints on the equation of states for neutron star interior from some observations, resonant pulsation due to external gravitational waves, gyro motion in tidal gravity, and nonlinear growth of bar instability of rotating stars.