Nonperturbative study of the two-frequency sine-Gordon model
Date: 2001
MTMT: 1114038
WoS ID: 000168904900002
Scopus ID: 0035858795
Abstract:
The two-frequency sine-Gordon model is examined. The focus is mainly on
the case when the ratio of the frequencies is 1/2, given the recent
interest in the literature. We discuss the model both in a perturbative
(form factor perturbation theory) and a nonperturbative (truncated
conformal space approach) framework, and give particular attention to a
phase transition conjectured earlier by Delfino and Mussardo. We give
substantial evidence that the transition is of second order and that it
is in the Ising universality class. Furthermore, we check the W-LR
operator correspondence and conjecture the phase diagram of the theory.
(C) 2001 Elsevier Science B.V. All rights reserved.