Boundary scattering in the principal chiral model

Abstract

An informal introduction to our recent work on the principal chiral model with boundary. We found that both classically integrable boundary conditions and quantum boundary S-matrices were classified by the symmetric spaces G/H. The connection is explained by the presence of a twisted Yangian algebra of non-local charges.Comment: Updated v2 based on talk at 'IFTs, Solitons and Duality', Sao Paulo 2002; v1 appeared in Proc. QGIS Prague 200