Some exact results for the two-point function of an integrable quantum field theory

Abstract
The two-point correlation function for the quantum nonlinear Schrödinger (one-dimensional δ-function gas) model is studied. An infinite-series representation for this function is derived using the quantum inverse-scattering formalism. For the case of zero temperature, the infinitecoupling (c) result of Jimbo, Miwa, Môri, and Sato is extended to give an exact expression for the order-1c correction to the two-point function in terms of a Painlevé transcendent of the fifth kind.

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