全局共谐概念型近Kahler流形

Ali A. Shihab
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摘要

当近Kahler流形为流形共调和常数型时,得到了永久共调和型近Kahler流形条件的概念。证明了型近Kahler流形的局部共调和常数等价于它的型全局共调和常数。并证明了近Kahler流形共调和常数型是常数曲率的流形。近似Kahler流形的常数概念是A.Greem([1],[2],[3])提出的,在近似Kahler流形的几何研究中被证明是非常有用的。接下来,常数型的近kahler流形考虑了不同的数学家(参见。[1],[3],[4],[5],[6],[7])。V.F.Kirichenko[6]得到了常数型近Kahler流形的全面描述。在[6]中证明了近Kahler流形的点向常数型由恒等式描述,其中B -一个函数在近Kahler流形上,。其中,近似Kahler流形的局部常数等价于其类型的局部常数。并且,第一类和第二类结构张量的协变常数可以立即得出,仅在近Kahler空间的一点上的类型常数意味着其类型的整体一致性。
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Global Conharmonic Concept Type Nearly Kahler Manifold
The concept of permanence conharmonic type Nearly Kahler manifold conditions are obtained when the Nearly Kahler manifold is a manifold conharmonic constant type. Proved that the local conharmonic constancy of type Nearly Kahler manifold is equivalent to its global conharmonic constancy of type. And also proved that the Nearly Kahler manifold conharmonic constant type is a manifold of constant scalar curvature.The notion of constancy of type Nearly Kahler manifolds was introduced A.Greem ([1], [2], [3]) and has proved very useful in the study of the geometry of nearly kahler manifolds. Next nearly kahler manifolds of constant type considered various mathematicians (see. [1], [3], [4], [5], [6], [7]). Comprehensive description of Nearly Kahler manifolds of constant type was obtained V.F.Kirichenko [6]. In [6] it is shown that Nearly Kahler manifold of pointwise constant type description by the identity  , where B - a function on Nearly Kahler manifold, . Wherein local constancy of type Nearly Kahler manifold is equivalent to the local constancy of its type. Moreover, the covariant constancy of structure tensors of the first and second kind it follows immediately that, the constancy of type at only one point Nearly Kahler space implies global consistency of its type.
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