Abstract
Continuing a previous investigation, we present the quantum Gelfand-Levitan method for the cubic Schrödinger model with attractive coupling. We express the Heisenberg field operator in terms of operators which create the energy eigenstates and use this result to calculate the four-point Green function.
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Göckeler, M. Quantum Gelfand-Levitan method for the cubic schrödinger field theory with attractive coupling. Z. Phys. C - Particles and Fields 11, 125–134 (1981). https://doi.org/10.1007/BF01573995
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DOI: https://doi.org/10.1007/BF01573995