Non-integrable Quantum Field Theories as Perturbations of Certain Integrable Models

Дата и время публикации : 1996-03-04T14:34:33Z

Авторы публикации и институты :
G. Delfino
G. Mussardo
P. Simonetti

Ссылка на журнал-издание: Nucl.Phys.B473:469-508,1996
Коментарии к cтатье: 60 pages, latex, 9 figures
Первичная категория: hep-th

Все категории : hep-th, cond-mat

Краткий обзор статьи: We approach the study of non–integrable 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 $T sim T_c$ 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 diagonalization of their Hamiltonian.

Category: Physics