Nonintegrable aspects of the multifrequency Sine-Gordon model

Sep, 1997
38 pages
Published in:
  • Nucl.Phys.B 516 (1998) 675-703
e-Print:
Report number:
  • ISAS-EP-97-106,
  • IC-97-129

Citations per year

1997200420112018202502468
Abstract:
We consider the two-dimensional quantum field theory of a scalar field self-interacting via two periodic terms of frequencies α\alpha and β\beta. Looking at the theory as a perturbed Sine-Gordon model, we use Form Factor Perturbation Theory to analyse the evolution of the spectrum of particle excitations. We show how, within this formalism, the non-locality of the perturbation with respect to the solitons is responsible for their confinement in the perturbed theory. The effects of the frequency ratio α/β\alpha/\beta being a rational or irrational number and the occurrence of massless flows from the gaussian to the Ising fixed point are also discussed. A generalisation of the Ashkin-Teller model and the massive Schwinger model are presented as examples of application of the formalism.
Note:
  • 39 pages, latex, 10 figures Report-no: ISAS/EP/97/106, IC/97/129
  • 11.25.Db
  • I1.l0.Kk
  • Form factor perturbation theory
  • Soliton confinement
  • sine-Gordon model
  • dimension: 2
  • perturbation theory: higher-order
  • form factor
  • soliton
  • integrability