Commutator criteria for strong mixing
Commutator criteria for strong mixing
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强混合换向器标准
DOI:
10.1017/etds.2015.47
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
R. T. Aldecoa
中科院分区:
文献类型:
--
作者:
R. T. Aldecoa
We present new criteria, based on commutator methods, for the strong mixing property of discrete flows $\{U^N\}_{N\in\mathbb Z}$ and continuous flows $\{{\rm e}^{-itH}\}_{t\in\mathbb R}$ induced by unitary operators $U$ and self-adjoint operators $H$ in a Hilbert space $\mathcal H$. Our approach put into evidence a general definition for the topological degree of the curves $N\mapsto U^N$ and $t\mapsto{\rm e}^{-itH}$ in the unitary group of $\mathcal H$. Among other examples, our results apply to skew products of compact Lie groups, time changes of horocycle flows and adjacency operators on graphs.