Variétés de contacts complexes.

Abstract

Our objective was to study the symmetry properties of complex contact manifolds. We started by studying the symmetry properties of normal complex contact manifolds, namely, Ricci-symmetry, Ricci-semi-symmetry and Ricci-pseudo-symmetry. The results obtained : 1. A normal complex contact manifold is Ricci-semi-symmetric if and only if it is an Einstein manifold. 2. A complex contact space form with constant GH-sectional curvature c is est properly Ricci-pseudo-symmetric (Lρ 6= 0) if and only if c = −1. 3. The non-existence of properly pseudo-symmetric (LR 6= 0) complex contact space form. In addition, the symmetry properties of complex (κ, µ)-spaces have been studied and it has been shown that 1. The complex (κ, µ)-spaces (κ < 1) are not Einstein. 2. The complex (κ, µ)-spaces (κ < 1) are Ricci-symmetric, Ricci-semi-symmetric if and only if they are locally isometric to C n+1 × CP n(16). 3. The complex (κ, µ)-spaces (κ < 1) are not properly Ricci-pseudo-symmetric. 4. The space C n+1 × CP n(16) is locally symmetric.