天体磁场起源的新解释  

A New Explanation for the Origin of Magnetic Field of Celestial Bodies

作　　者：辜英求 

机构地区：[1]复旦大学数学科学学院,上海

出　　处：《自然科学》2019年第6期464-470,共7页Open Journal of Nature Science

摘　　要：地球磁场对生态系统以及天体磁场对宇宙大尺度结构的形成有着重要的作用,但是天体磁场的起源和演化规律至今还是一个悬而未决的难题。已有的多种理论假说,都存在一些难以克服的困难。现在学术界比较容易接受的理论是所谓的发电机模型,该理论认为天体内部液态的磁流体运动,能够克服欧姆耗散并产生持久的微弱电流和宏观磁场。但是这个模型需要一个启动的种子磁场,天体内部很多原始物理参数很难获取,大范围的流体运动也没有很稳定的解,这些都是发电机模型的困难。此外发电机模型也很难解释星球偶极矩磁场与其角动量之间的关联性。本文利用Clifford代数计算了粒子自旋与天体引力场之间的耦合作用,我们发现旋转星球会给旋量场提供了一个与偶极子磁场相同的宏观引力场Ωα,星球内部带电粒子的自旋都会沿着Ωα的力线规则排列起来,从而诱导出一个宏观磁场。计算表明Ωα场强正比于星球的角动量,这也就解释了星球磁场强度与角动量的关联性。本文的结论提示,深入研究天体内部物理参数如密度、速度、压力和温度等对Ωα场的影响,对进一步理解天体磁场可能会有重要作用。The magnetic field of the earth plays an important role in the ecosystem, and the magnetic field of celestial bodies is also important in the formation of cosmic large-scale structures, but the origin and evolution of the magnetic field of celestial bodies are still unresolved mysteries. Many hy-potheses to explain the origin have been proposed, but there are some insurmountable difficulties for each one. At present, the theory widely accepted in scientific society is the dynamo model, it says that the movement of magneto fluid inside celestial bodies can overcome the Ohm effect and produce persistent weak electric current and macroscopic magnetic field. However, this model needs an initial seed magnetic field, the original values of many physical parameters inside the celestial body are difficult to obtain, and there is no stable solution to the large range of fluid motion, these are the difficulties for the dynamo model. Furthermore, it is difficult for the dynamo to explain the correlation between the dipole magnetic field and angular momentum of a celestial body. In this paper, by calculating the interaction between spin of particles and gravity of celestial body according to Clifford algebra, we find that a rotational celestial body provides a field Ωα similar to the magnetic field of a dipole for spins, and the spins of charged particles within the celestial body are arranged along the flux line of Ωα, then a macroscopic magnetic field is induced. The calculation shows that the strength of Ωα is proportional to the angular momentum of the celestial body, which explains the correlation between the magnetic intensity and angular momentum. The results of this paper suggest that further study of the effects of internal variables such as density, velocity, pressure and temperature of a celestial body on Ωα may provide more insights into the origin of magnetic field of celestial bodies.

关 键 词：地球磁场 天体磁场 磁偶极子 CLIFFORD代数 DIRAC方程 自旋引力耦合 弯曲时空 

分 类 号：G63[文化科学—教育学]