Mixed q-gaussian algebras

Marius Junge University of Illinois, Urbana Qiang eng Harvard University CMSA

Publications of CMSA of Harvard mathscidoc:1702.38076

We provide a unified approach for constructing Wick words in mixed q-Gaussian algebras, which are generated by sj = aj +a ∗ j , j = 1, · · · , N, where aia ∗ j −qija ∗ j ai = δij . Here we also allow equality in −1 ≤ qij = qji ≤ 1. This approach relies on Speicher’s central limit theorem and the ultraproduct of von Neumann algebras. We also use the unified argument to show that the Ornstein–Uhlenbeck semigroup is hypercontractive, the Riesz transform associated to the number operator is bounded, and the number operator satisfies the Lp Poincar´e inequalities with constants C √p. Finally we prove that the mixed q-Gaussian algebra is weakly amenable and strongly solid in the sense of Ozawa and Popa. Our approach is mainly combinatorial and probabilistic. The results in this paper can be regarded as generalizations of previous results due to Speicher, Biane, Lust-Piquard, Avsec, et al.
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  author={Marius Junge, and Qiang eng},
Marius Junge, and Qiang eng. MIXED q-GAUSSIAN ALGEBRAS. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170208004958124716303.
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