Combinatorial aspects of boundary loop models

Details Combinatorial aspects of boundary loop models Combinatorial aspects of boundary loop models

2007-09-06

arxiv.org/abs/0709.0812v2

Physics

Mathematical Physics

v2: Added new figures 6, 9, 12, 13, 17. Further comparison with Ref. [7]

Scientific paper

10.1088/1742-5468/2008/01/P01021

We discuss in this paper combinatorial aspects of boundary loop models, that is models of self-avoiding loops on a strip where loops get different weights depending on whether they touch the left, the right, both or no boundary. These models are described algebraically by a generalization of the Temperley-Lieb algebra, dubbed the two-boundary TL algebra. We give results for the dimensions of TL representations and the corresponding degeneracies in the partition functions. We interpret these results in terms of fusion and in the light of the recently uncovered A_n large symmetry present in loop models, paving the way for the analysis of the conformal field theory properties. Finally, we propose conjectures for determinants of Gram matrices in all cases, including the two-boundary one, which has recently been discussed by de Gier and Nichols.

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