排序方式: 共有38条查询结果,搜索用时 15 毫秒
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本文通过强作用K-π中间态,利用色散关系理论计算了Г(K_(μ3)~+)/Г(K_(3)~+),Г(K_2~0→πμ~+ν)/Г(K_2~0→πe~+ν),{Г(K_2~0→πe~+ν)+Г(K_2~0→πe~-ν)}/Г(K_(3)~+)分支比及K_(μ3)~+衰变中的μ谱,当选择定则|ΔI|=1/2及ΔS=+ΔQ被破坏,并且I_x=1/2及I_x=3/2的振幅f~[(3/2)(1/2)](0)及f~[(3/2)(3/2)](0)不等时,上述分支比与实验能很好符合。在本文的理论中,形式因子不是常数。 相似文献
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By making use of the φ-mapping topological current theory, this paper shows that the Gauss-Bonnet-Chern density (the Euler-Poincaré characteristic χ(M) density) can be expressed in terms of a smooth vector field φ and take the form of δ(φ), which means that only the zeros of φ contribute to χ(M). This is the elementary fact of the Hopf theorem. Furthermore, it presents that a new topological tensor current of -branes can be derived from the Gauss-Bonnet-Chern density. Using this topological current, it obtains the generalized Nambu action for multi -branes. 相似文献
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It is well known that 't Hooft-Polykov magnetic monopole regularly realizes the Dirac magnetic monopole in terms of a two-rank tensor, i.e. the so-called 't Hooft tensor in three-dimensional space, which has been generalized to all even rank ones. We propose an arbitrary odd rank 't Hooft tensor, which universally determines the quantized low-energy boundaries of the even dimensional Georgi-Glashow models under asymptotic conditions. Furthermore, the dual magnetic monopole theory is built up in terms of the J-mapping theory. 相似文献
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利用推广 Gross- Pitaevskii方程 ,分别研究了 (2 +1 )维时空和 3维空间的 Bose- Einstein凝聚体中涡旋的拓扑结构 .这一推广的方程能够被用于非均匀并且高度非线形的 Bose- Einstein凝聚系统 .利用Φ映射拓扑流理论 ,给出了基于序参数的涡旋速度场,以及该速度场的拓扑结构 .最后 ,仔细地探讨了这两种 Bose- Einstein系统中涡旋的各种分支条件.We studied the topological structure of vortex in the Bose-Einstein condensation with a generalized Gross-Pitaevskii equation in (2+1)-dimensional space-time and 3-dimensional space, respectively. Such equation can be used in discussing Bose-Einstein condensates in heterogeneous and highly nonlinear systems. An explicit expression for the vortex velocity field as a function of the order parameter field is derived in terms of the Φ -mapping theory, and the topological structure of ... 相似文献
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The topological properties of the spatial coherence function are investigated rigorously. The phase singular structures (coherence vortices) of coherence function can be naturally deduced from the topological current, which is an abstract mathematical object studied previously. We find that coherence vortices are characterized by the Hopf index and Brouwer degree in topology. The coherence flux quantization and the linking of the closed coherence vortices are also studied from the topological properties of the spatial coherence function. 相似文献
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