Disjointness of representations arising in harmonic analysis on the infinite-dimensional unitary group

Details Disjointness of representations arising in harmonic analysis on the infinite-dimensional unitary group Disjointness of representations arising in harmonic analysis on the infinite-dimensional unitary group

2008-05-17

arxiv.org/abs/0805.2660v2

Funct. Anal. Appl. , 44 (2010), no. 2, 92-105

Mathematics

Representation Theory

22 pages; some references added, introduction revised, minor changes in text

Scientific paper

We prove pairwise disjointness of representations T_{z,w} of the infinite-dimensional unitary group. These representations provide a natural generalization of the regular representation for the case of "big" group U(\infty). They were introduced and studied by G.Olshanski and A.Borodin. Disjointness of the representations can be reduced to disjointness of certain probability measures on the space of paths in the Gelfand-Tsetlin graph. We prove the latter disjointness using probabilistic and combinatorial methods.

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