On a Class of Special Riemannian Manifolds

Details On a Class of Special Riemannian Manifolds On a Class of Special Riemannian Manifolds

2011-06-14

arxiv.org/abs/1106.2758v1

Mathematics

Differential Geometry

4 pages

Scientific paper

We consider a four dimensional Riemannian manifold M with a metric g and an affinor structure q. We note the local coordinates of g and q are circulant matrices. Their first orders are (A, B, C, B)(A, B, C are smooth functions on M) and (0, 1, 0, 0), respectively. Let nabla be the connection of g. Then we obtain: 1) q^{4}=id; g(qx, qy)=g(x,y), x, y are arbitrary vector fields on M, 2) nabla q =0 if and only if grad A=(grad C)q^{2}; 2.grad B= (grad C)(q+q^{3}),

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