The Intrinsic Coupling in Integrable Quantum Field Theories
نویسندگان
چکیده
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 nonperturbatively and to high accuracy from the form factors of an (integrable) QFT. The technique is illustrated and tested with the Ising model, the XYmodel and the O(3) nonlinear sigma-model. The results are compared to those from high precision lattice simulations.
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تاریخ انتشار 2000