Defect lines, dualities, and generalised orbifolds

Abstract

Defects are a useful tool in the study of quantum field theories. This is illustrated in the example of two-dimensional conformal field theories. We describe how defect lines and their junction points appear in the description of symmetries and order-disorder dualities, as well as in the orbifold construction and a generalisation thereof that covers exceptional modular invariants.

7 pages, 6 figures. Contribution to the proceedings of the XVI International Congress on Mathematical Physics, Prague, August 3-8, 2009

References in corpus (5)

• Duality and defects in rational conformal field theory
• Topological defects for the free boson CFT
• Reflection and Transmission for Conformal Defects
• Cardy algebras and sewing constraints, I
• Gerbe-holonomy for surfaces with defect networks

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