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Let (M, PM) be a compact projective manifold and Aut (M, PM) its group of automorphisms. The purpose of this paper is to study the topological properties of (M, PM) if Aut (M, PM) ) is not discrete by applying the results of 13 and the Benzekri's functor which associates to a projective manifold a radiant affine manifold. This enables us to show that the orbits of the connected component of Aut (M, PM) are immersed projective submanifolds. We also classify 3-dimensional compact projective manifolds such that dim (Aut (M, PM) ) 2.
Aristide Tsemo (Fri,) studied this question.