Four-dimensional locally strongly convex homogeneous affine hypersurfaces

Abstract

Abstract. We study 4 dimensional locally strongly convex, locally homogeneous, hypersurfaces whose affine shape operator has two distinct principal curvatures. In case that one of the eigenvalues has dimension 1 these hypersurfaces have been previously studied in [4], [6] and [2] in which a classification of such submanifolds was obtained in dimension 4 and 5 under the additional assumption that the multiplicity of one of the eigenvalues is 1. In this paper we complete the classification in dimension 4 by considering the case that the multiplicity of both eigenvalues is 2.Mathematics Subject Classification (2010). 53A15.