Computing Number Fluctuations

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Here we try and delienate the properties of the function that corresponds to fluctuations in the momentum distribution. The quantity denoted by $ N(k,k^{'}) $ is quite an interesting object. It satisfies various elegant sum rules and is also quite singular in some respects. All these properties are brought out and a formal connection is found between this object and the momentum distribution of the interacting and non-interacting many-fermion systems. This exercise is quite general in that it does not refer to any particular hamiltonian. It is also quite useful since in an earlier preprint(cond-mat/9810043) we showed how to compute the spectral function and single-particle lifetime of homogeneous Fermi systems where the only undetermined quantity was this function $ N(k,k^{'}) $.
3 pages, Tex

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Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/28715

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9810308
 http://arxiv.org/abs/cond-mat/9810308

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arXiv