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Two-time correlation functions of a system of Bose particles are studied. Wefind relation of zeros of the correlation functions with the Lee-Yang zeros ofpartition function of the system. Obtained relation gives the possibility toobserve the Lee-Yang zeros experimentally. A particular case of Bose particleson two levels is examined and zeros of two-time correlation functions andLee-Yang zeros of partition function of the system are analyzed.

Two-time correlation functions and the Lee-Yang zeros for an interacting Bose gas