Dynamical stability and Lyapunov exponents for holomorphic endomorphisms of ℙ(k)

We introduce a notion of stability for equilibrium measures in holomorphic families of endomorphisms of ℙ k and prove that it is equivalent to the stability of repelling cycles and equivalent to the existence of some measurable holomorphic motion of Julia sets which we call equilibrium lamination. We characterize the corresponding bifurcations by the strict subharmonicity of the sum of Lyapunov exponents or the instability of critical dynamics and analyze how repelling cycles may bifurcate. Our methods deeply exploit the properties of Lyapunov exponents and are based on ergodic and pluripotential theory.