Nonintegrable aspects of the multifrequency Sine-Gordon model
Sep, 199738 pages
Published in:
- Nucl.Phys.B 516 (1998) 675-703
e-Print:
- hep-th/9709028 [hep-th]
Report number:
- ISAS-EP-97-106,
- IC-97-129
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Abstract:
We consider the two-dimensional quantum field theory of a scalar field self-interacting via two periodic terms of frequencies and . 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 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
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