Tridiagonal Symmetries of Models of Nonequilibrium Physics

Boyka Aneva

Symmetry, integrability and geometry: methods and applications, Tome 4 (2008)

Résumé

We study the boundary symmetries of models of nonequilibrium physics where the steady state behaviour strongly depends on the boundary rates. Within the matrix product state approach to many-body systems the physics is described in terms of matrices defining a noncommutative space with a quantum group symmetry. Boundary processes lead to a reduction of the bulk symmetry. We argue that the boundary operators of an interacting system with simple exclusion generate a tridiagonal algebra whose irreducible representations are expressed in terms of the Askey–Wilson polynomials. We show that the boundary algebras of the symmetric and the totally asymmetric processes are the proper limits of the partially asymmetric ones. In all three type of processes the tridiagonal algebra arises as a symmetry of the boundary problem and allows for the exact solvability of the model.

Détail

Keywords: driven many-body systems; nonequilibrium; tridiagonal algebra; Askey–Wilson polynomials.

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