The intrinsic coupling in integrable quantum field theories
Jan, 2000
69 pages
Published in:
- Nucl.Phys.B 583 (2000) 614-670
e-Print:
- hep-th/0001097 [hep-th]
Report number:
- BUTP-2000-01,
- MPI-PHT-2000-01
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Abstract:
The intrinsic 4-point coupling, defined in terms of a truncated 4-point function at zero momentum, provides a well-established measure for the interaction strength of a QFT. We show that this coupling can be computed non-perturbatively and to high accuracy from the form factors of an (integrable) QFT. The technique is illustrated and tested with the Ising model, the XY-model and the O(3) nonlinear sigma-model. The results are compared to those from high precision lattice simulations.- 11.10.Kk
- 11.10.Lm
- Integrable systems
- Bethe ansatz
- Form factors
- Ising model
- XY-model
- O(3) sigma-model
- axiomatic field theory
- n-point function: 4
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