Invertible defects and isomorphisms of rational CFTs

Details Invertible defects and isomorphisms of rational CFTs Invertible defects and isomorphisms of rational CFTs

2010-04-27

arxiv.org/abs/1004.4725v1

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 17 figures.

Scientific paper

Given two two-dimensional conformal field theories, a domain wall -- or defect line -- between them is called invertible if there is another defect with which it fuses to the identity defect. A defect is called topological if it is transparent to the stress tensor. A conformal isomorphism between the two CFTs is a linear isomorphism between their state spaces which preserves the stress tensor and is compatible with the operator product expansion. We show that for rational CFTs there is a one-to-one correspondence between invertible topological defects and conformal isomorphisms if both preserve the rational symmetry. This correspondence is compatible with composition.

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