Defect lines, dualities, and generalised orbifolds
arXiv:0909.5013 · doi:10.1142/9789814304634_0056
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