On a generalization of the Jacobi operator in the Riemannian geometry

Authors

  • Grozio Stanilov
  • Veselin Videv

Abstract

Let (M,g) be a Riemannian manifold of dimension n with curvature tensor R. If X,Y is an orthonormal pair of tangent vectors at a point p of M, we define the curvature operator λX,Y(u)=12(R(u,X,Y)+R(u,Y,X)). It is a symmetric operator but its eigen values depend on the base X,Y of the tangent subspace E2(p;X,Y) spanned by X,Y. We prove: 1) the Einstein manifolds are unique for which the trace of this operator does noe depend on the base of E2(p;X,Y); 2)the real space forms of dimension 4 are the unique for which the spectrum of this operator does not depend on the base of E2(p;X,Y). Of course in both assertions p is an arbitrary point of M

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Published

1994-12-12

How to Cite

Stanilov, G., & Videv, V. (1994). On a generalization of the Jacobi operator in the Riemannian geometry. Ann. Sofia Univ. Fac. Math. And Inf., 86(1), 27–34. Retrieved from https://annual.uni-sofia.bg/index.php/fmi/article/view/432