Statistical Biharmonicity of Identity Maps

The tension field of the identity map from a statistical manifold to a Riemannian statistical manifold, which shares the same Riemannian metric, is the Tchevychev vector field multiplied by negative one. We derive a new class of statistical manifolds that satisfy the semi-equiaffine condition based on the statistical biharmonicity of the identity map. Furthermore, we determine the statistical structures of this class, when the pair of the manifold and the Riemannian metric is a simply connected complete Riemannian manifold of constant curvature.