Geodesic
Complex one-frequency cocycles
Journal of the European Mathematical Society, Tome 16 (2014) no. 9, pp. 1915-1935.

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We show that on a dense open set of analytic one-frequency complex valued cocycles in arbitrary dimension Oseledets filtration is either dominated or trivial. The underlying mechanism is different from that of the Bochi-Viana Theorem for continuous cocycles, which links non-domination with discontinuity of the Lyapunov exponent. Indeed, in our setting the Lyapunov exponents are shown to depend continuously on the cocycle, even if the initial irrational frequency is allowed to vary. On the other hand, this last property provides a good control of the periodic approximations of a cocycle, allowing us to show that domination can be characterized, in the presence of a gap in the Lyapunov spectrum, by additional regularity of the dependence of sums of Lyapunov exponents.
DOI : 10.4171/jems/479
Classification : 37-XX, 34-XX
Keywords: Analytic cocycles, dominated splittings, Lyapunov exponents 
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Artur Avila; Svetlana Jitomirskaya; Christian Sadel. Complex one-frequency cocycles. Journal of the European Mathematical Society, Tome 16 (2014) no. 9, pp. 1915-1935. doi : 10.4171/jems/479. http://geodesic.mathdoc.fr/articles/10.4171/jems/479/

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