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In this paper, we give a microscopic derivation of Gibbs measures for the focusing cubic nonlinear Schrödinger equation on the one-dimensional torus from many-body quantum Gibbs states. Since we are not making any positivity assumptions on the interaction, it is necessary to introduce a truncation of the mass in the classical setting and of the rescaled particle number in the quantum setting. Our methods are based on a perturbative expansion of the interaction, similarly as in [ 1 ]. Due to the presence of the truncation, the obtained series have infinite radius of convergence. We treat the case of bounded,  L1  and delta function interaction potentials, without any sign assumptions. Within this framework, we also study time-dependent correlation functions. This is the first such known result in the focusing regime.

A microscopic derivation of Gibbs measures for the 1D focusing cubic nonlinear Schrödinger equation