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arXiv math/0511406math.OAmath.PR
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非对易概率下的Lp空间合并理论

Theory of Amalgamated Lp Spaces in Noncommutative Probability

Marius Junge, Javier Parcet

摘要:

设$f_1, f_2, ..., f_n$是概率空间$(Ω, \mathcal{F}, μ)$中给定随机变量f的一族独立拷贝。然后,当$1 \le q \le p < \infty$ $$\Big(\int_Ω \Big[ \sum_{k=1}^n |f_k|^q \Big]^{\frac{p}{q}} d μ\Big)^{\frac1p} \sim \max_{r \in \{p,q\}} {n^{\frac1r} \Big(\int_Ω|f|^r dμ\Big)^{\frac1r}}.$$成立时,以下范数等价成立。我们证明了一个非交换的类似的不等式,用于给定的von Neumann子代数上的自由随机变量和。这种提法导致新的类的非交换函数空间出现在量子概率作为平方函数,条件平方函数和极大函数。我们的主要工具是自由随机变量的Rosenthal型不等式,非交换鞅理论和算子值解析函数的因子分解。这使得我们可以把这个不等式推广到算子空间范畴中的非交换L_p上。此外,自由随机变量的使用产生了$p=\infty$的正确公式,它没有可交换的对应物。

英文摘要:

Let $f_1, f_2, ..., f_n$ be a family of independent copies of a given random variable f in a probability space $(Ω, \mathcal{F}, μ)$. Then, the following equivalence of norms holds whenever $1 \le q \le p < \infty$ $$\Big(\int_Ω \Big[ \sum_{k=1}^n |f_k|^q \Big]^{\frac{p}{q}} d μ\Big)^{\frac1p} \sim \max_{r \in \{p,q\}} {n^{\frac1r} \Big(\int_Ω|f|^r dμ\Big)^{\frac1r}}.$$ We prove a noncommutative analogue of this inequality for sums of free random variables over a given von Neumann subalgebra. This formulation leads to new classes of noncommutative function spaces which appear in quantum probability as square functions, conditioned square functions and maximal functions. Our main tools are Rosenthal type inequalities for free random variables, noncommutative martingale theory and factorization of operator-valued analytic functions. This allows us to generalize this inequality as a result for noncommutative L_p in the category of operator spaces. Moreover, the use of free random variables produces the right formulation for $p=\infty$, which has not a commutative counterpart.

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