The structure of the perturbation series of the spin-1 Bose gas at low temperatures

Details The structure of the perturbation series of the spin-1 Bose gas at low temperatures The structure of the perturbation series of the spin-1 Bose gas at low temperatures

2001-06-16

arxiv.org/abs/cond-mat/0106312v1

Phys. Rev. A 65, 043602 (2002)

Physics

Condensed Matter

Soft Condensed Matter

34 pages, 17 figures

Scientific paper

10.1103/PhysRevA.65.043602

The properties of Green's functions and various correlation functions of density and spin operators are considered in a homogeneous spin-1 Bose gas in different phases. The dielectric formalism is worked out and the partial coincidence of the one-particle and collective spectra is pointed out below the temperature of Bose-Einstein condensation. As an application the formalism is used to give two approximations for the propagators and the correlation functions and the spectra of excitations including shifts and widths due to the thermal cloud.

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