%0 Journal Article
%T Exact C=1 Boundary Conformal Field Theories
%A Curtis G. Callan
%A Igor R. Klebanov
%J Physics
%D 1993
%I arXiv
%R 10.1103/PhysRevLett.72.1968
%X We present a solution of the problem of a free massless scalar field on the half line interacting through a periodic potential on the boundary. For a critical value of the period, this system is a conformal field theory with a non-trivial and explicitly calculable S-matrix for scattering from the boundary. Unlike all other exactly solvable conformal field theories, it is non-rational ({\it i.e.} has infinitely many primary fields). It describes the critical behavior of a number of condensed matter systems, including dissipative quantum mechanics and of barriers in ``quantum wires''.
%U http://arxiv.org/abs/hep-th/9311092v1