We approach the study of non-interable models of two-dimensional quantum field theory as perturbations of the integrable ones. By exploiting the knowledge of the exact S-matrix and form factors of the integrable field theories we obtain the first-order corrections to the mass ratios, the vacuum energy density and the S-matrix of the non-integrable theories. As interesting applications of the formalism, we study the scaling region of the Ising model in an external magnetic field at T similar to T-c and the scaling region around the minimal model M(2,7). For these models, a remarkable agreement is observed between the theoretical predictions and the data extracted by a numerical diagonalisation of their Hamiltonian.
|Titolo:||Non-integrable quantum field theories as perturbations of certain integrable models|
|Autori:||Delfino G; Mussardo G; Simonetti P|
|Data di pubblicazione:||1996|
|Digital Object Identifier (DOI):||10.1016/0550-3213(96)00265-9|
|Appare nelle tipologie:||1.1 Journal article|