From Defects to Boundaries

Abstract

In this paper we describe how relativistic field theories containing defects are equivalent to a class of boundary field theories. As a consequence previously derived results for boundaries can be directly applied to defects, these results include reduction formulas, the Coleman-Thun mechanism and Cutcosky rules. For integrable theories the defect crossing unitarity equation can be derived and defect operator found. For a generic purely transmitting impurity we use the boundary bootstrap method to obtain solutions of the defect Yang-Baxter equation. The groundstate energy on the strip with defects is also calculated.

14 pages, 10 figures. V2 Removed comparison to RT algebras and added paragraph on the usefulness of transmitting defects in the study of boundary systems. References added. V3 Extended to include application to defect TBA

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• Four-Dimensional Superconformal Theories with Interacting Boundaries or Defects
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