Boundary effects in twodimensional critical and offcritical systems
Abstract
Critical systems are described by conformal field theories, whose dynamics can be exactly solved in two dimensions. In the presence of a boundary, with the socalled method of images it is possible to study the surface critical behaviour of these systems, and the conformal boundary conditions can be related to the bulk operator content of the theory. After an overview of the basic concepts of bulk and boundary conformal field theory, we present an explicit calculation of some twopoint correlation functions in Virasoro minimal models with boundary. In the second part of the thesis, we summarize the known results about perturbed conformal field theories, which describe the dynamics of systems away from the critical point. We concentrate on cases in which the offcritical massive field theory is integrable, with a corresponding purely elastic and factorized scattering theory, focusing our attention on the bootstrap approach. We also present the basic properties of affine Toda field theories, whose Smatrices are closely related to the ones of some perturbed minimal models. In the presence of a boundary, assuming that the boundary conditions are compatible with integrability, the scattering theory is still elastic and factorized. The analytic structure of the reflection matrix encodes the boundary spectrum of the theory, in the light of a bootstrap approach analogous to the bulk one. Starting from two kinds of known reflection amplitudes, we have performed a detailed study of the boundary bound states structure for the three E_{n} affine Toda field theories and for the corresponding perturbed minimal models.
 Publication:

arXiv eprints
 Pub Date:
 June 2001
 arXiv:
 arXiv:hepth/0106268
 Bibcode:
 2001hep.th....6268R
 Keywords:

 High Energy Physics  Theory
 EPrint:
 121 pages, LATEX file, degree thesis