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arXiv 1110.1817math.DG
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具有附加结构的四维黎曼流形中的几乎共形变换

Almost conformal transformation in a four dimensional Riemannian manifold with an additional structure

Iva Dokuzova

摘要:

考虑具有度量g和仿射结构q的四维黎曼流形M.这些张量的局部坐标是循环矩阵。它们的第一阶分别是(A,B,C,B),A,B,C \in FM和(0,1,0,0)。我们构造了M上的另一个度量\tilde{g}.我们找到了\tilde{g}是一个正定义度量的条件,以及q是关于g的黎曼联络的平行结构的条件.此外,设x是T_{p} M中的任意向量,其中p是M上的点。设x和qx,x和q^{2}x相对于g的夹角为θ和θ。我们借助角$ϕ$和θ来表示x和qx、x和q^{2}x相对于$\tilde{g}$的夹角。同时,我们构造了两个级数{n_{n}}和{n_{n}}。我们证明了每一个函数都是递增函数,并且是收敛的。

英文摘要:

We consider a four dimensional Riemannian manifold M with a metric g and affinor structure q. The local coordinates of these tensors are circulant matrices. Their first orders are (A, B, C, B), A, B, C\in FM and (0, 1, 0, 0), respectively. We construct another metric \tilde{g} on M. We find the conditions for \tilde{g} to be a positively defined metric, and for q to be a parallel structure with respect to the Riemannian connection of g. Further, let x be an arbitrary vector in T_{p}M, where p is a point on M. Let ϕand ϕbe the angles between x and qx, x and q^{2}x with respect to g. We express the angles between x and qx, x and q^{2}x with respect to $\tilde{g}$ with the help of the angles $ϕ$ and ϕ. Also,we construct two series {ϕ_{n}}and {ϕ_{n}}. We prove that every of it is an increasing one and it is converge.

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