# Article

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Keywords:
real hypersurface; complex two-plane Grassmannian; Hopf hypersurface; generalized Tanaka-Webster connection; normal Jacobi operator; generalized Tanaka-Webster parallel normal Jacobi operator
Summary:
We study the classifying problem of immersed submanifolds in Hermitian symmetric spaces. Typically in this paper, we deal with real hypersurfaces in a complex two-plane Grassmannian \$G_2({\mathbb C}^{m+2})\$ which has a remarkable geometric structure as a Hermitian symmetric space of rank 2. In relation to the generalized Tanaka-Webster connection, we consider a new concept of the parallel normal Jacobi operator for real hypersurfaces in \$G_2({\mathbb C}^{m+2})\$ and prove non-existence of real hypersurfaces in \$G_2({\mathbb C}^{m+2})\$ with generalized Tanaka-Webster parallel normal Jacobi operator.
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