Polynomial diffeomorphisms of C^2: V. Critical points and Lyapunov exponents

Details Polynomial diffeomorphisms of C^2: V. Critical points and Lyapunov exponents Polynomial diffeomorphisms of C^2: V. Critical points and Lyapunov exponents

1996-07-03

arxiv.org/abs/math/9606204v1

Mathematics

Complex Variables

Scientific paper

In this paper we continue our study of polynomial diffeomorphisms of C^2. Let us recall that there is an invariant measure $\mu$, which is the pluri-complex version of the harmonic measure of the Julia set for polynomial maps of C. In this paper we give an integral formula for the Lyapunov exponents of a polynomial automorphism with respect to $\mu$ analogous to the Brolin-Manning formula polynomial maps of C. Our formula relates the Lyapunov exponents to the value of a Green function at a type of critical point which we define in this paper. We show that these critical points have a very natural dynamical interpretation.

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