Unitarity conditions for a many-body system at zero temperature

Ginzburg, S. L.; Maleev, S. V.

doi:10.1007/bf01028532

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2018

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“…The imaginary part Σ I (ν, p) of the self-energy determines the damping of impurity spectrum due to collisions with Bose particles. It is not difficult to obtain a diagrammatic representation for Σ I (ν, p) by applying of the unitarity conditions [27] for the diagram in Fig. 1.…”

Section: Model and Methods Descriptionmentioning

confidence: 99%

Impurity self-energy in the strongly-correlated Bose systems

Panochko

Pastukhov

Vakarchuk

2018

Int. J. Mod. Phys. B

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We proposed the non-perturbative scheme for calculation of the impurity spectrum in the Bose system at zero temperature. The method is based on the path-integral formulation and describes an impurity as a zero-density ideal Fermi gas interacting with Bose system for which the action is written in terms of density fluctuations. On the example of the 3 He atom immersed in the liquid helium-4 a good consistency with experimental data and results of Monte Carlo simulations is shown.

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Section: Model and Methods Descriptionmentioning

confidence: 99%