Livsic theorem for matrix cocycles

Details Livsic theorem for matrix cocycles Livsic theorem for matrix cocycles

2008-08-03

arxiv.org/abs/0808.0350v2

Mathematics

Dynamical Systems

To appear in Annals of Mathematics.

Scientific paper

We prove the Liv\v{s}ic Theorem for arbitrary $GL(m,\mathbb R)$ cocycles. We consider a hyperbolic dynamical system $f : X \to X$ and a H\"older continuous function $A: X \to GL(m,\mathbb R)$. We show that if $A$ has trivial periodic data, i.e. $A(f^{n-1} p) ... A(fp) A(p) = Id$ for each periodic point $p=f^n p$, then there exists a H\"older continuous function $C: X \to GL(m,\mathbb R)$ satisfying $A (x) = C(f x) C(x) ^{-1}$ for all $x \in X$. The main new ingredients in the proof are results of independent interest on relations between the periodic data, Lyapunov exponents, and uniform estimates on growth of products along orbits for an arbitrary H\"older function $A$.

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