2009/09/28 by Jürg Fröhlich, Jürgen Fuchs, Ingo Runkel +1 · 1 citation
Mathematics · Physics and Astronomy · #hep-th #math-ph #math.MP
paper · pdf · doi:10.1142/9789814304634_0056
7 pages, 6 figures. Contribution to the proceedings of the XVI International Congress on Mathematical Physics, Prague, August 3-8, 2009
arxiv created 2009/09/28 · arxiv updated 2017/08/23
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.