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# Infnite-dimensional Schur-Weyl duality and the Coxeter-Laplace operator

(21 Sep 2012)  Key: citeulike:11302579

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### Abstract

We extend the classical Schur-Weyl duality between representations of the groups \$SL(n,\C)\$ and \$\sN\$ to the case of \$SL(n,\C)\$ and the infinite symmetric group \$\sinf\$. Our construction is based on a "dynamic," or inductive, scheme of Schur-Weyl dualities. It leads to a new class of representations of the infinite symmetric group, which have not appeared earlier. We describe these representations and, in particular, find their spectral types with respect to the Gelfand-Tsetlin algebra. The main example of such a representation acts in an incomplete infinite tensor product. As an important application, we consider the weak limit of the so-called Coxeter-Laplace operator, which is essentially the Hamiltonian of the XXX Heisenberg model, in these representations.