The intrinsic coupling in integrable quantum field theories
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.
- Publication:
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Nuclear Physics B
- Pub Date:
- September 2000
- DOI:
- 10.1016/S0550-3213(00)00277-7
- arXiv:
- arXiv:hep-th/0001097
- Bibcode:
- 2000NuPhB.583..614B
- Keywords:
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- High Energy Physics - Theory;
- High Energy Physics - Lattice
- E-Print:
- 69 pages, Latex