Quantized orthonormal systems: A non-commutative Kwapień theorem

Details Quantized orthonormal systems: A non-commutative Kwapień theorem Quantized orthonormal systems: A non-commutative Kwapień theorem

2003-12-11

arxiv.org/abs/math/0312245v1

Studia Math. 155 (2003), 273-294

Mathematics

Operator Algebras

26 pages

Scientific paper

The concepts of Riesz type and cotype of a given Banach space are extended to a non-commutative setting. First, the Banach space is replaced by an operator space. The notion of quantized orthonormal system, which plays the role of the orthonormal system in the classical setting, is then defined. The Fourier type and cotype of an operator space with respect to a non-commutative compact group fit in this context. Also, the quantized analogs of Rademacher and Gaussian systems are treated. All this is used to obtain an operator space version of the classical theorem of Kwapie\'n characterizing Hilbert spaces by means of vector-valued orthogonal series. Several approaches to this result with different consequences are given.

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