Spectral properties of four-time fermionic Green's functions

The spectral relations for the four-time fermionic Green’s functions are derived in the most general case. The
 terms which correspond to the zero-frequency anomalies, known before only for the bosonic Green’s functions,
 are separated and their connection with the second cumulants o...

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Published in:Condensed Matter Physics
Date:2016
Main Author: Shvaika, A.M.
Format: Article
Language:English
Published: Інститут фізики конденсованих систем НАН України 2016
Online Access:https://nasplib.isofts.kiev.ua/handle/123456789/156225
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Journal Title:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this:Spectral properties of four-time fermionic Green’s
 functions / A.M. Shvaika // Condensed Matter Physics. — 2016. — Т. 19, № 3. — С. 33004: 1–14. — Бібліогр.: 51 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Summary:The spectral relations for the four-time fermionic Green’s functions are derived in the most general case. The
 terms which correspond to the zero-frequency anomalies, known before only for the bosonic Green’s functions,
 are separated and their connection with the second cumulants of the Boltzmann distribution function is elucidated. The high-frequency expansions of the four-time fermionic Green’s functions are provided for different
 directions in the frequency space Отримано в найбiльш загальнiй формi спектральнi спiввiдношення для чотиричасових фермiонних функцiй Ґрiна. Видiлено аномальнi внески на нульовiй частотi, якi ранiше були вiдомi тiльки для бозонних
 функцiй Ґрiна, та висвiтлено їхнiй зв’язок з другими кумулянтами функцiї розподiлу Больцмана. Приведено високочастотнi розклади чотиричасових фермiонних функцiй Ґрiна для рiзних напрямкiв в просторi
 частот.
ISSN:1607-324X