Multiplicative ergodic theorem on flag bundles of semi-simple Liegroups

Luciana A. Alves; Luiz A. B. San Martin

doi:10.3934/dcds.2013.33.1247

Article Contents

2013, Volume 33, Issue 4: 1247-1273. Doi: 10.3934/dcds.2013.33.1247

This issue Previous Article Critical points of functionalized Lagrangians Next Article On a variational approach for the analysis and numerical simulation of ODEs

Multiplicative ergodic theorem on flag bundles of semi-simple Lie groups

Luciana A. Alves^1, and
Luiz A. B. San Martin^2,

1.
Faculdade de Matemática - Universidade Federal de Uberlândia, Campus Santa Mônica, Av. João Naves de Ávila - 2121 38.408-100, Uberlândia - MG
2.
Imecc - Unicamp, Departamento de Matemática, Rua Sérgio Buarque de Holanda, 651, Cidade Universitária Zeferino Vaz 13083-859, Campinas - SP

Received: August 31, 2011

Revised: December 31, 2011

Published: March 2013

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Abstract

Let $Q\rightarrow X$ be a principal bundle having as structural group $G$ a reductive Lie group in the Harish-Chandra class that includes the case when $G$ is semi-simple with finite center. A semiflow $\phi _{k}$ of endomorphisms of $Q$ induces a semiflow $\psi _{k}$ on the associated bundle $\mathbb{E}=Q\times _{G}\mathbb{F}$, where $\mathbb{F}$ is the maximal flag bundle of $G$. The $A$-component of the Iwasawa decomposition $G=KAN$ yields an additive vector valued cocycle $\mathsf{a}\left( k,\xi \right) $, $\xi \in \mathbb{E}$, over $\psi _{k}$ with values in the Lie algebra $\mathfrak{a}$ of $A$. We prove the Multiplicative Ergodic Theorem of Oseledets for this cocycle: If $\nu $ is a probability measure invariant by the semiflow on $X$ then the $\mathfrak{a}$-Lyapunov exponent $\lambda \left( \xi \right) =\lim \frac{1}{k}\mathsf{a}\left( k,\xi \right) $ exists for every $\xi $ on the fibers above a set of full $\nu $-measure. The level sets of $\lambda \left( \cdot \right) $ on the fibers are described in algebraic terms. When $\phi _{k}$ is a flow the description of the level sets is sharpened. We relate the cocycle $\mathsf{a}\left( k,\xi \right) $ with the Lyapunov exponents of a linear flow on a vector bundle and other growth rates.

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Mathematics Subject Classification: Primary: 37H15, 22E46, 37B55.

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