Associative-algebraic approach to logarithmic conformal field theories

Abstract

We set up a strategy for studying large families of logarithmic conformal field theories by using the enlarged symmetries and non--semi-simple associative algebras appearing in their lattice regularizations (as discussed in a companion paper). Here we work out in detail two examples of theories derived as the continuum limit of XXZ spin-1/2 chains, which are related to spin chains with supersymmetry algebras gl($n|n$) and gl($n+1|n$), respectively, with open (or free) boundary conditions in all cases. These theories can also be viewed as vertex models, or as loop models. Their continuum limits are boundary conformal field theories (CFTs) with central charge $c=-2$ and $c=0$ respectively, and in the loop interpretation they describe dense polymers and the boundaries of critical percolation clusters, respectively. We also discuss the case of dilute (critical) polymers as another boundary CFT with $c=0$. Within the supersymmetric formulations, these boundary CFTs describe the fixed points of certain nonlinear sigma models that have a supercoset space as the target manifold, and of Landau-Ginzburg field theories. The submodule structures of indecomposable representations of the Virasoro algebra appearing in the boundary CFT, representing local fields, are derived from the lattice. A central result is the derivation of the fusion rules for these fields.

References in corpus (3)

• Enlarged symmetry algebras of spin chains, loop models, and S-matrices
• Kazhdan--Lusztig-dual quantum group for logarithmic extensions of Virasoro minimal models
• The O(n) model on the annulus

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• Coset Graphs in Bulk and Boundary Logarithmic Minimal Models
• SLE local martingales in logarithmic representations
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• Fusion in the periodic Temperley-Lieb algebra and connectivity operators of loop models
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• Emergence of Kac-Moody Symmetry in Critical Quantum Spin Chains
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