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Abstract: Starting from the Dyson-Beliaev and generalized Gross-Pitaevskii equationswith an extra nonlocal potential, we derive an exact expression of thetwo-particle Green-s function K for an interacting Bose-Einstein condensate interms of unambiguously defined self-energies and vertices. The formula can be aconvenient basis for approximate calculations of K. It also tells us that polesof K are not shared with i.e. shifted from those of the single-particleGreen-s function, contrary to the conclusion of previous studies.



Autor: Takafumi Kita

Fuente: https://arxiv.org/







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