A generalized Jacobi operator in the 4-dimensional Riemannian geometry

Authors

  • Grozio Stanilov
  • Irina Petrova

Abstract

We consider a Riemannina manifold (M,g) of dimension n with curvature tensor R. At a point pM we take a 2-dimensional tangent plane E2 of the tangent space Mp, spanned by an orthonormal pair of vectors X,Y. We define the lienar operator λX,Y:MpMp by λX,Y(u)=R(u,X,X)+R(u,Y,Y). It is a symmetric operator and a very important fact is namely the assertion it is invariant operator under the orthogonal transformations in E2. This gives us the possibility to define an operator in respect to any E2 in Mp:λE2=λX,Y. In the general case its eigen values depend of p and of E2 also. Then we investigate the class of S-Riemannian manifolds of dimension 4 with the property the eigen values ci(p;E2),i=1,2,3,4 of the operators λE2 are independent of E2

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Published

1993-12-12

How to Cite

Stanilov, G., & Petrova, I. (1993). A generalized Jacobi operator in the 4-dimensional Riemannian geometry. Ann. Sofia Univ. Fac. Math. And Inf., 85, 55–64. Retrieved from https://annual.uni-sofia.bg/index.php/fmi/article/view/454