The Jordan Structure of Two Dimensional Loop Models

Details The Jordan Structure of Two Dimensional Loop Models The Jordan Structure of Two Dimensional Loop Models

2011-01-14

arxiv.org/abs/1101.2885v4

J.Stat.Mech.1104:P04007,2011

Physics

Mathematical Physics

55 pages

Scientific paper

10.1088/1742-5468/2011/04/P04007

We show how to use the link representation of the transfer matrix $D_N$ of loop models on the lattice to calculate partition functions, at criticality, of the Fortuin-Kasteleyn model with various boundary conditions and parameter $\beta = 2 \cos(\pi(1-a/b)), a,b\in \mathbb N$ and, more specifically, partition functions of the corresponding $Q$-Potts spin models, with $Q=\beta^2$. The braid limit of $D_N$ is shown to be a central element $F_N(\beta)$ of the Temperley-Lieb algebra $TL_N(\beta)$, its eigenvalues are determined and, for generic $\beta$, a basis of its eigenvectors is constructed using the Wenzl-Jones projector. To any element of this basis is associated a number of defects $d$, $0\le d\le N$, and the basis vectors with the same $d$ span a sector. Because components of these eigenvectors are singular when $b \in \mathbb{Z}^*$ and $a \in 2 \mathbb{Z} + 1$, the link representations of $F_N$ and $D_N$ are shown to have Jordan blocks between sectors $d$ and $d'$ when $d-d' < 2b$ and $(d+d')/2 \equiv b-1 \ \textrm{mod} \ 2b$ ($d>d'$). When $a$ and $b$ do not satisfy the previous constraint, $D_N$ is diagonalizable.

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