Lyapunov spectrum of square-tiled cyclic covers

Details Lyapunov spectrum of square-tiled cyclic covers Lyapunov spectrum of square-tiled cyclic covers

2010-07-29

arxiv.org/abs/1007.5330v2

Mathematics

Dynamical Systems

The presentation is simplified. The algebro-geometric background is described more clearly and in more details. Some typos are

Scientific paper

A cyclic cover over the Riemann sphere branched at four points inherits a natural flat structure from the "pillow" flat structure on the basic sphere. We give an explicit formula for all individual Lyapunov exponents of the Hodge bundle over the corresponding arithmetic Teichmuller curve. The key technical element is evaluation of degrees of line subbundles of the Hodge bundle, corresponding to eigenspaces of the induced action of deck transformations.

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