Spectral multiplicities for ergodic flows

Details Spectral multiplicities for ergodic flows Spectral multiplicities for ergodic flows

2010-08-28

arxiv.org/abs/1008.4845v1

Mathematics

Dynamical Systems

Scientific paper

Let $E$ be a subset of positive integers such that $E\cap\{1,2\}\ne\emptyset$. A weakly mixing finite measure preserving flow $T=(T_t)_{t\in\Bbb R}$ is constructed such that the set of spectral multiplicities (of the corresponding Koopman unitary representation generated by $T$) is $E$. Moreover, for each non-zero $t\in\Bbb R$, the set of spectral multiplicities of the transformation $T_t$ is also $E$. These results are partly extended to actions of some other locally compact second countable Abelian groups.

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