The intrinsic coupling in integrable quantum field theories
Copyright policy )The intrinsic coupling in integrable quantum field theories
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.
69 pages, Latex
- Max Planck Society Germany
- University of Arizona United States
- Eötvös Loránd University Hungary
- Physics Department United States
- Institute for Theoretical Physics Switzerland
High Energy Physics - Theory, High Energy Physics - Lattice, High Energy Physics - Theory (hep-th), High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, Model quantum field theories, Groups and algebras in quantum theory and relations with integrable systems, Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics, Simulation and numerical modelling (quantum field theory)
High Energy Physics - Theory, High Energy Physics - Lattice, High Energy Physics - Theory (hep-th), High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, Model quantum field theories, Groups and algebras in quantum theory and relations with integrable systems, Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics, Simulation and numerical modelling (quantum field theory)
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