On operator-valued free convolution powers
On operator-valued free convolution powers
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关于算子值的自由卷积幂
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发表时间:
2011
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通讯作者:
D. Shlyakhtenko
中科院分区:
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作者:
D. Shlyakhtenko
We give an explicit realization of the $\eta$-convolution power of an $A$-valued distribution, as defined earlier by Anshelevich, Belinschi, Fevrier and Nica. If $\eta:A\to A$ is completely positive and $\eta\geq\operatorname{id}$, we give a short proof of positivity of the $\eta$-convolution power of a positive distribution. Conversely, if $\eta\not\geq\operatorname{id}$, and $s$ is large enough, we construct an $s$-tuple whose $A$-valued distribution is positive, but has non-positive $\eta$-convolution power.