Minimal Models with Integrable Local Defects

Details Minimal Models with Integrable Local Defects Minimal Models with Integrable Local Defects

1997-08-25

arxiv.org/abs/hep-th/9708135v2

Nucl.Phys. B549 (1999) 546-562

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, one figure

Scientific paper

10.1016/S0550-3213(99)00111-X

We describe a general way of constructing integrable defect theories as perturbations of conformal field theory by local defect operators. The method relies on folding the system onto a boundary field theory of twice the central charge. The classification of integrable defect theories obtained in this way parallels that of integrable bulk theories which are a perturbation of the tensor product of two conformal field theories. These include local defect perturbations of all $c<1$ minimal models, as well as of the coset theories based on SO(2n), obtained in this way. We discuss in detail the former case of all the Virasoro minimal models. In the Ising case our construction corresponds to having a spin field as a defect operator; in the folded formulation this is mapped onto an orbifolding of the boundary sine-Gordon theory at $\beta^2/8\pi = 1/8$, or a version of the anisotropic Kondo model.

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