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ISING MODEL IN A MAGNETIC FIELD: THE QUANTUM FIELD THEORY ApPROACH TO THE CALCULATION OF THE SPIN-SPIN CORRELATION FUNCTION *

Gesualdo Delfino A, Giuseppe Mussardo

Published Jan 1, 1997• 0 citations
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A program is proposed to study numerically the correlation functions in massive integrable 2D relativistic field theories. It relies crucially on the exact form factors of fields which can be reconstructed from the factorized scattering data. The correlation functions are expressible as infinite sums over intermediate asymptotic states. We suggest using computer power to perform the summation numerically. The convergence of the sum is tested for the simplest example of the scaling Ising spin-spin correlations (without magnetic field).