Completely Integrable Equation for the Quantum Correlation Function of Nonlinear Schrödinger Eqaution

Abstract

Correlation functions of exactly solvable models can be described by differential equation [Barough, McCoy, Wu]. In this paper we show that for non free fermionic case differential equations should be replaced by integro-differential equations. We derive an integro-differential equation, which describes time and temperature dependent correlation function $<\psi (0,0){\psi }^{†}(x,t){>}_T$ of penetrable Bose gas. The integro-differential equation turns out be the continuum generalization of classical nonlinear Schrödinger equation.

LaTEX file, 23 pages

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