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arXiv 1109.4367math.DS
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遍历作用量的新谱重数

New spectral multiplicities for ergodic actions

Anton V. Solomko

摘要:

设G是局部紧的第二可数阿贝尔群.给定G在标准概率空间上的一个保测度作用T,设M(T)表示G的Koopman酉表示的谱重数函数的本质值集.当G是离散可数阿贝尔群或R^n,n>0时,证明了对于弱混合G-作用T,N的{p,q,pq},{p,q,r,pq,pr,qr,pqr}等形式的集合或任何乘(加)子半群都可实现为M(T).

英文摘要:

Let G be a locally compact second countable Abelian group. Given a measure preserving action T of G on a standard probability space, let M(T) denote the set of essential values of the spectral multiplicity function of the Koopman unitary representation of G associated with T. In the case when G is either a discrete countable Abelian group or R^n, n>0, it is shown that the sets of the form {p,q,pq}, {p,q,r,pq,pr,qr,pqr} etc. or any multiplicative (and additive) subsemigroup of N are realizable as M(T) for a weakly mixing G-action T.

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