排序方式: 共有17条查询结果,搜索用时 0 毫秒
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Alexander I. Nesterov 《General Relativity and Gravitation》1997,29(9):1115-1122
We study topology change in (2+1)D gravity coupling with non-Abelian SO(2, 1) Higgs field from the point of view of Morse theory. It is shown that the Higgs potential can be identified as a Morse function. The critical points of the latter (i.e. loci of change of the spacetime topology) coincide with zeros of the Higgs field. In these critical points the two-dimensional metric becomes degenerate, but the curvature remains bounded. 相似文献
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确定硼烷的杂硼烷价成键轨道对称性的拓扑方法 总被引:1,自引:0,他引:1
本文通过对硼烷的分子轨道的定域化分析, 建立了由硼烷或杂硼烷的骨架多面体的几何性质, 确定其价成键轨道对称性的拓扑方法。从以多面体骨架的三角面和缺顶点周围的边为基约化出的不同约表示中, 按建议的能量与节面数的对应规则,选定出分子的价成键轨道所属的不可约表示。 相似文献
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We propose a modified form of the spontaneousbirth of the universe by quantum tunneling. It proceedsthrough topology change and inflation, to eventuallybecome a universe with closed spatial sections of negative spatial curvature and nontrivialglobal topology. 相似文献
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本文介绍了一个计算机自动识别有机化合物结构图中原子的拓扑等价性的新方法, 该方法引入了路径指数和环指数等新的图的不变量以表征节点的拓扑环境, 由此正确地且高效地进行原子的等价类划分。 相似文献
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Helio V. Fagundes 《General Relativity and Gravitation》1998,30(9):1437-1438
A few corrections and comments are made upon a previously published paper, on the subject of cosmological models with compact spatial sections. 相似文献