On a generalization of the Jacobi operator in the Riemannian geometry
Authors
Grozio Stanilov
Veselin Videv
Abstract
Let be a Riemannian manifold of dimension with curvature tensor . If is an orthonormal pair of tangent vectors at a point of , we define the curvature operator . It is a symmetric operator but its eigen values depend on the base of the tangent subspace spanned by . We prove: 1) the Einstein manifolds are unique for which the trace of this operator does noe depend on the base of ; 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 . Of course in both assertions is an arbitrary point of
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