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MULTIPLICATIVE ERGODIC THEOREM ON FLAG BUNDLES OF SEMI-SIMPLE LIE GROUPS

机译:半简单李群标志束上的乘性遍历定理

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Let Q →y 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 φ_k of endomorphisms of Q induces a semiflow ψ_k on the associated bundle E = Q ×_G F, where F is the maximal flag bundle of G. The A-component of the Iwasawa decomposition G = KAN yields an additive vector valued cocycle a (k,ξ),ξ∈E, over ψ_k. with values in the Lie algebra a of A. We prove the Multiplicative Ergodic Theorem of Oseledets for this cocycle: If v is a probability measure invariant by the semiflow on X then the α-Lyapunov exponent λ (ξ) = lim 1/k a (k,ξ) exists for every ξ on the fibers above a set of full v-measure. The level sets of λ(?) on the fibers are described in algebraic terms. When φ_k is a flow the description of the level sets is sharpened. We relate the cocycle a (k,ξ) with the Lyapunov exponents of a linear flow on a vector bundle and other growth rates.
机译:令Q→y X为Harish-Chandra类中具有还原性Lie基团作为结构基团G的主束,其中包括G为半简单且中心有限的情况。 Q的亚同质性的半流φ_k引起相关束E = Q×_G F的半流ψ_k,其中F是G的最大标志束。岩泽分解的A分量G = KAN产生一个附加值,其向量为cocycle a (k,ξ),ξ∈E,超过ψ_k。我们证明了该cocycle的Oseledets乘性遍历定理:如果v是X上半流不变量的概率测度,则α-Lyapunov指数λ(ξ)= lim 1 / ka(一组完全v度量之上的纤维上的每个ξ都存在k,ξ)。光纤上的λ(α)能级集用代数术语描述。当φ_k是流时,对级别集的描述会更加清晰。我们将cocycle a(k,ξ)与矢量束和其他增长率上的线性流的Lyapunov指数相关。

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