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Studies on the Superfluid Vortices in Neutron Star Interious

中子星内部超流体涡旋的研究

基本信息

批准号：
04640275
负责人：
SHIBAZAKI Noriaki
金额：
$ 1.41万
依托单位：
Rikkyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

The vortex creep motion in the inner crust is one of mechanisms which couple the superfluid to the crust. We have already shown by the linear analysis that this coupling is unstable below a critical temperature. We have investigated how this instability develops after the onset, conducting the numerical calculations with nonlinear terms. The main results are summarized as follows.1. The instability develops into a limit-cycle, in which the temperature and angular velocity difference between crust and superfluid oscillate.2. This instabity is identified to be a frictional instability. The instability grows because the increase of friction due to the temperature increase dominates over the decrease of friction due to the decrease of angular velocity difference.3. The internal torque becomes larger than the external torque in some phase of the oscillation and the crust is even spun-up.We have also studied the energy release and particle acceleration in the neutron star magnetosphere. The main results are as follows.1. The global structure of the magnetosphere has been determined for the first time, solving the Grad-shafranov equation. We found that the energy disspation in the magnetosphere is required in order to determaine the structure.2. The sudden discharge caused by a perturbation in the magnetosphere of a dead pulsar cannot yield an energy release rate larger than that of the magnetic dipole radiation. This makes the discharge model for the gamma-ray bursts unlikely.

地壳内部的涡旋蠕动是超流与地壳耦合的机制之一。我们已经通过线性分析表明，这种耦合在临界温度以下是不稳定的。我们研究了这种不稳定性如何发展后发病，进行数值计算与非线性项。主要研究结果如下：1.这种不稳定性发展为极限环，在极限环中，地壳与超流之间的温差和角速度差振荡.这种不稳定性被确定为摩擦不稳定性。由于温度升高引起的摩擦力的增加超过了角速度差减小引起的摩擦力的减小，不稳定性增大.在振荡的某些阶段，内转矩变得大于外转矩，地壳甚至被旋起。我们还研究了中子星星磁层中的能量释放和粒子加速。主要研究结果如下：1.通过求解Grad-shafranov方程，首次确定了磁层的全球结构。我们发现，磁层中的能量耗散是决定结构的必要条件.由死脉冲星的磁层扰动引起的突然放电不能产生比磁偶极辐射更大的能量释放率。这使得伽马射线暴的放电模型不太可能。