Exact Solution of a Boundary Conformal Field Theory
arXiv:hep-th/9402113 · doi:10.1016/0550-3213(94)90440-5
Abstract
We study the conformal field theory of a free massless scalar field living on the half line with interactions introduced via a periodic potential at the boundary. An SU(2) current algebra underlies this system and the interacting boundary state is given by a global SU(2) rotation of the left-moving fields in the zero-potential (Neumann) boundary state. As the potential strength varies from zero to infinity, the boundary state interpolates between the Neumann and the Dirichlet values. The full S-matrix for scattering from the boundary, with arbitrary particle production, is explicitly computed. To maintain unitarity, it is necessary to attribute a hidden discrete ``soliton'' degree of freedom to the boundary. The same unitarity puzzle occurs in the Kondo problem, and we anticipate a similar solution.
harvmac and epsf, 36 pages with 5 figures; v2: the version which appeared in NPB including a Note Added on the band structure of open strings
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Cited by in corpus (155)
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