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) QF...

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Bibliographic Details
Published inNuclear physics. B Vol. 583; no. 3; pp. 614 - 670
Main Authors Balog, J., Niedermaier, M., Niedermayer, F., Patrascioiu, A., Seiler, E., Weisz, P.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 11.09.2000
Subjects
Bethe ansatz
Form factors
Integrable systems
Ising model
O sigma-model
XY-model
11.10.Lm
Bethe ansatz
O sigma-model
11.10.Kk
Ising model
Integrable systems
Form factors
XY-model
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Summary: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.
ISSN:0550-3213
1873-1562
DOI:10.1016/S0550-3213(00)00277-7