Statistical mechanics of an exactly integrable system
- 1 May 1981
- journal article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 22 (5) , 1084-1089
- https://doi.org/10.1063/1.524991
Abstract
The equilibrium thermodynamics of the nonlinear Schrödinger model at finite temperature is calculated by means of the quantum inverse method. Working directly in an infinite volume we derive the equation of state and the integral equation which determines the excitation spectrum. This integral equation is found to be closely related to the Gelfand–Levitan expression for the charge density operator.Keywords
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