共查询到20条相似文献,搜索用时 93 毫秒
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在历史上,人们最初认为磁现象是正负磁荷产生的。但是,长期以来,从没有人发现过单独的磁北极或磁南极。因此,传统上认为磁是一种固有的双极现象,即任何一块磁体无论怎样细分,最后每一小块磁体总是显示出两个相反磁性区--磁北极和磁南极,这就是两磁极的不可分性。在安培提出分子电流是物质磁性的基本来源之后,这种不可分性得到了完满的解释。此后又断言,单独的磁荷或磁荷的基本单元--磁单极子是不存在的。这一论断构成了宏观电磁理论的基础,例如磁场的高斯定理就是自然界不存在磁单极子的数学表述。然而,这并不妨碍探索微观领域中是否存在磁单极子成为物理学家很感兴趣的一个课题。 相似文献
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研究磁单极子发现,它的纯N性磁场线和纯S性磁场线,存在难以连接成线的问题,并且与传统的磁场线在结构上不同,能否取代传统磁场又是一个问题;在不违背同性相斥,异性相吸规则前提下,能否解决所提问题,这是磁单极子面对的新问题。 相似文献
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MO Shu-Fan REN Ji-Rong ZHU Tao 《理论物理通讯》2009,51(2):293-298
In this paper, by making use of Duan's topological current theory, the branch process of regular magnetic monopoles is discussed in detail. Regular magnetic monopoles are found generating or annihilating at the limit point and encountering, splitting, or merging at the bifurcation point and the degenerate point systematically of the vector order parameter field φ(x). Furthermore, it is also shown that when regular magnetic monopoles split or merge at the degenerate point of field function φ, the total topological charges of the regular magnetic monopoles are stilI unchanged. 相似文献
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The results on the non-existence of purely magnetic solutions are extended to the wider class of spacetimes which have homothetic electric and magnetic Weyl fields. This class is a particularization of the spacetimes admitting a direction for which the relative electric and magnetic Weyl fields are aligned. We give an invariant characterization of these metrics and study the properties of their Debever null vectors. The directions observing aligned electric and magnetic Weyl fields are obtained for every Petrov-Bel type. 相似文献
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No Heading We study the Dirac equation in 3+1 dimensions with non-minimal coupling to an isotropic radial three-vector potential and
in the presence of a static electromagnetic potential. The space component of the electromagnetic potential has angular (non-central)
dependence such that the Dirac equation separates completely in spherical coordinates. We obtain solutions for the case where
the three-vector potential is linear in the radial coordinate (Dirac oscillator) and the time component of the electro-magnetic
potential vanishes. The relativistic energy spectrum and spinor eigenfunctions are obtained. 相似文献
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提出了一种定义在10维时空上的SO(17)统一模型,通过相对于陪集空间SU(3)/U(1)×U(1)×Z2的维度退化,得到了具有三代轻费米子的标准模型. 相似文献
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G. Ziino 《International Journal of Theoretical Physics》2000,39(11):2605-2622
The monopole question is treated anew in the light of a recent, strictly covariant,extended formulation of fermion quantum field theory naturally including alsoa pseudoscalar variety of conserved charges. The essential novelty lies in theresulting quantum property of anticommutivity between scalar and pseudoscalarcharge varieties, which should in particular apply to electric and magnetic charges.As an immediate outcome, there should no longer be any (Dirac-like) quantizationcondition relating these charges and binding the magnetic elementary charge tohave a very great strength. A generalized Lagrangian approach to the monopoleproblem is made truly viable, leading to two independent local gauge couplingswhich are separately generated by the electric and magnetic elementary chargesand are not allowed to interfere. This would prevent electric and magneticmonopoles from mutually interacting and would particularly account for theabsence of magnetic sources in ordinary electromagnetism. Within such aframework, an electric charge eigenstate with a nonzero eigenvalue is bound tohave a null magnetic charge expectation value, and the magnetic dipole momentof an electrically charged point fermion may actually be seen as resulting fromthe additional internal presence of a single magnetic charge subjected to a maximaluncertainty in sign. An easy estimate makes it allowable to assign to this chargea strength just equal to that of the partner electric charge. Such a conjecture leadsto a dual model of a charged point fermion where the electric and magneticroles can well be interchanged with no observable effects. In the associatedformalism, duality symmetry is already included without the need to appeal toany missing electromagnetic phenomenology to be discovered. 相似文献
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杨-密耳斯理论的单极机制 总被引:1,自引:0,他引:1
对于未加规范条件的杨-密耳斯理论,提出了SU(2)规范场一种新的离壳分解.在一定的规范条件下,该分解可以导出类似于Skyrme-Faddeev形式的Wilson作用量并在经典层次上肯定了色单位矢量场的高阶导数的存在.进一步独立地证明了’tHooft关于低能杨-密耳斯理论的单极动力学是投射无关的猜想. 相似文献
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设计了一个以STM32F103为控制核心的电永磁控制器,实现了在交流380V输入电压下, 对电永磁本体进行充退磁。系统输入电压经同步变压器降压处理后,由过零检测电路获取过零信号,然后通过STM32F103输出脉冲串,经脉冲变压器KCB6743加至可控硅,实现了半波整流电路精确的功率输出;灵活简单的按键操作以及完整的显示功能,很好的实现了人机互动。通过测试本系统能准确的对电永磁本体充退磁操作,并且能够通过按键设置充退磁电流,实现电永磁的磁力大小调整。该控制器具有成本低、易操作、通用性强以及高可靠性的特点,使其广泛应用于电磁领域。 相似文献