Perturbative versus nonperturbative QFT: Lessons from the O(3) NLS model
Apr, 199612 pages
Published in:
- Phys.Lett.B 386 (1996) 224-232
e-Print:
- hep-th/9604161 [hep-th]
Report number:
- MPI-PHT-96-25
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Abstract:
The two-point functions of the energy-momentum tensor and the Noether current are used to probe the O(3) nonlinear sigma model in an energy range below in units of the mass gap . We argue that the form factor approach, with the form factor series trunctated at the 6-particle level, provides an almost exact solution of the model in this energy range. The onset of the (2-loop) perturbative regime is found to occur only at energies around .Note:
- 13 pages LaTex, 4 PostScript figures; version published in Physics Letters B
- sigma model: nonlinear
- symmetry: O(3)
- perturbation theory
- nonperturbative
- tensor: energy-momentum
- two-point function
- spectral representation
- numerical calculations
References(12)
Figures(4)